Oh, your timeline of events is clearer now. That changes my interpretation of the night entirely. I thought you were flirting at a party, and instead of progressing, you set up a dinner date for another night. What actually happened was all the flirting was happening during class, and then you spoiled it by saying "Bam! Dinner date!"
I will mention - saying "I'm taking you out to dinner" CAN work, if it's in the situation that you're walking in, and claiming what you want. You have a lot of confidence, so much that she's trusting you enough to just go with it. I saw it on "Catch me if you can" and I thought I'd try it for myself, next time I was hitting it off with someone. And you know, it worked. But because I way very ballsy and clearly claming what I decided I wanted. However, it was mostly based on looks, and that meant when dinner rolled around, it was very awkward because we were clutching at straws trying to think of something to talk about. If I was as practiced then as I am now, I would have ended the dinner as quickly as possible and bounced somewhere else just to spice things up a bit.
But anyway, back to your situation.
When you announce “dinner”, it has cultural connotations. When you ask a girl out to dinner, it’s a “date”. And when you ask a girl out on a date, you’re saying “I am now officially starting the courtship process.” This causes several things to happen;
- If it’s not the ballsy situation above, then it’s probably after you two have been getting along well for a bit, and flirting. And then it looks like “Wow I’m turned on by this girl, I’m asking her out on a date”, which is the opposite of the ballsy “I’m claiming you and taking you out on a date.”
- You kill all the mystery and the possibility of things being allowed to progress more naturally
- You put her in “courtship mode”, which is a place in her head that’s usually filled up with needy guys that took her out on a boring “official date” from the outset. It’s not the place in her head where relationships started naturally or spontaneously. There is a good chance she is going to enter “I have to get rid of this guy” mode once she wakes up the next morning and realises what she agreed to.
- You express too much interest, by diving into “I want to date you!” talk, which is not good for someone you only spent a bit of time with, so far, no matter how good it was, even if you had sex.
- You put a lot of social pressure on the both of you to treat this as a “date”, and you barely know each other
- You’re requiring the both of you to spend a decent chunk of time and money (dinner cost) on each other and you may not even get along that well, you don’t know yet.
That is why the unspoken tradition is generally to “meet up for coffee” (even though actually saying “let’s meet up for coffee” is kind of lame). The bottom line is, you just have to find any simple,
low effort excuse to meet up again. If something requires a lot of effort, it’s going to be a risk of a time & money investment for not much reason yet, and the person pushing for it is going to look needy. A low effort meet-up can be a lot of things. It could be coffee, it could be during your lunch breaks if you work near each other, it could be something you’re already going to and inviting her along, it could even be a huge exciting music festival that you both happen to be going to that weekend with separate groups of friends but agree to text and bump into each other while you’re there - the bottom line is
low effort, not so much what you’re doing.
And the way you set this up is very casually - "hey we should chat again sometime, what are you doing for lunch on X..." etc. that kind of tone. and personalise it a bit if at all possible, anything, eg. "... you can tell me how X went" or "maybe by then X won't have blah blah, hahaha" that kind of thing. Whatever the conversation provided. This is not EVERY situation, but it's a good guideline.
This approach works a lot better because it avoids all the problems above. You get to meet up in a very low pressure, casual situation, have a chat, see how you get along, you may have the option to continue spending time together that day and extend the night with a movie, clubbing, dinner, whatever takes your fancy. And if time constraints don’t allow, well at the end of your “coffee” or whatever it was, you have the option then of setting up something like that.
And you had the perfect reason - the party your class was throwing. You would have told her you were looking forward to seeing her at the class party (and personalise it a bit). Because if she liked you as much as she did during class, she'd probably never want to leave once you're both hitting it off at the class party, and you could then offer to "bounce" to some other place as the night gets on a bit, if at all possible. It could be dinner, could be a movie, could be a walk in a nearby park. Or it could just be exploring the venue together, eg. sneaking out into the back rooms and trying doors to see which ones are open, and finding where they store things, feels a bit naughty.
So hopefully now you can see why arranging to meet up casually is so much more effective than “asking her out to dinner”.
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We were not friends on fb...is it possible to ask a mutual friend to connect somehow? I'm so sad now I'm thinking about making funny Youtube videos to impress her lol

After what you said she’s doing now? Fuck no. I already told you, this one is gone. Right now she’s nothing more than a painful lesson that you’re going to keep in your mind for the next girl you hit it off well with. Even though it doesn’t seem like you did anything that bad, it’s over, and this is just what we have to deal with as men. Use the energy to practice hitting on other random girls in the street or at the bus stop or whatever, as you go about your daily business. (Never go out for the sake of hitting on girls, because it will always feel like that and you will give off the wrong vibe)
If her response since that night has been; “no dinner, I’m busy, I’ll get back to you, I have a boyfriend”, she’s clearly pushing you away, and if you make YouTube videos for her, it’s going to be really creepy. While she’s already gone to you, the social implications for this could be very bad. That biological decision has already been made - it's important to understand that it's over now, and nothing can be done to change it. Anything you do will be more "reasons" for her not to like you.
This is what every guy goes through when they had something and then they lost it - it’s not just the feeling of losing something but it’s a feeling of self-deficiency that you did something to ruin it but not knowing what it is. But I’ve fast-tracked the situation for you by explaining what happened, so you can learn from this much more effectively and move on quicker.