I have been on two dates with a girl I really like that both seemed to go very well. On both dates she gave a considerable amount of IOI's and continually mentioned things she would be interested in doing with me in the future, i.e. future date ideas, etc. On the second date when we were back at her place she was resting her head on my shoulder in front of her roommates, and acting very girlfriendy. We went on her porch to smoke some weed, and she told me she liked me, and seemed very much into me. Afterwards, she told me I should drive home because she wanted to shower and get ready to go out that night, and that she would text me to meet up later. I got a text later that night saying it was one of her friends birthday's and they were having a girls night, and that she wanted to hang out another time this weekend. I texted her two days later early on sunday asking what she was up to and she didn't reply. I texted her again that evening asking her jokingly if her not responding meant she was busy and got no response again. I texted her this morning asking if she wanted to go out with me tonight, and this time she responded saying she wishes she could but she's extremely busy and that she would text me later this week if she wasn't busy, making me think that she has somehow lost interest in me.
You could say I have oneitis, but I have gone out with and had sex with plenty of girls in the last year, and haven't liked any of them as much as her. I even broke things off with a fb after our first date went well, because I didn't feel right having sex with another girl behind her back. Do I still have a chance with this girl, or is she over me?

"asking her jokingly if her not responding meant she was busy and got no response again"

HUGE mistake.

You have left yourself with no other choice but to ignore her and game other girls.

Yea, I'm sure some highschool girl or whatever is EXTREMELY busy all week. She's probably sitting on her bed texting her girlfriends right now bored as fuck.

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“Nothing is impossible, the word itself says 'I'm possible'!” ~Audrey Hepburn

From what I read, it seems like you lost it when you were in front of her roommates. On the porch was probably the best time for you to for a kiss close if she showed enough IOI's.

With text there isn't much you can do with a long fuse, low investment (flakiness, slow or no replies etc.) Best you can do is to ping her. Pinging is a short, humorous text that creates a fun vibe. Send her one ping per week. If she replies to one of them positively, continue joking and don't push for another meet. Only push for her meet if her investment is very high. (laughing a lot, quick replies, playful roleplay)
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"Everything you do will be insignificant, but it is very important that you do it" - Gandhi

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Should have been more specific in the post, I k closed after dinner when we were in the park, we were making out throughout the night.

Just try pinging her as explained earlier. Pushing for a meet while her investment is low, or sending needy texts is a mistake many guys make. Send her some ping's to see if she takes the baits. Also, go out gaming other women. It will make you feel better and give you more options

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"Everything you do will be insignificant, but it is very important that you do it" - Gandhi

Consider everyone advice on your topic, that's what I would do. I don't know whether you kiss closed her or not but if you didn''t I feel that you should have, especially if she was giving you IOIs to do so. If the txt messages Andre2807 told you to text don't get you any results start going after other women. If she wants you she will call you back if not at least you have other options. Whatever you do stop showing alot of intrest in this girl even if you feel you need to do so. When women know that you so too much interest in them it turns them off or they think they can take advantage of you. So play it cool meet other women and she will get the picture that you are a busy man as well