dude, maybe this wasn't thoroughly explained well enough when you wrote your first initial posts, one of the first parts of the pickup, is the screening process, getting to know her, seeing what she is like, screening for compliance, screening for chemistry, everything

lets put it this way man, this girl is not sexually available for you right now, she is not interested in sleeping with you, but because you work together, she gives you an ''I like you, but no'' to protect your ego, so you get away from this ordeal without a hurt sense of pride, she gave you the nice girl SPAM

she also told you she had another guy, then later came up with a different excuse from a different frame that she just wans't sure it would... blah blah blah

her behavior is highly inconsistent from her words
I know you're super needy for this girl, but you don't have chemistry with her at all, this is a one sided infatuation because you don't have anything else going for you, you say that you are meeting alot of girls etc., but obviously things aren't working out for you and it isn't a regular thing, or just asking a girl out on a date wouldn't been as big a deal for you as it was, you have to get that shit handled in your life, not cling to every girl you make an emotional investment into, if it really means that much to you just to invest as little as asking a girl out, then you need to put yourself out there more until making your pitch isn't a big deal to you anymore, it's easy to think an attractive girl is perfect, if that's the only attractive girl you know and socialize with, some guys even go so far as to take extreme disrespect to the point of abuse just because a girl is good looking and gives them attention when other girls don't (even if the attention is negative and abusive), and they will justify this with retarded reasons, like, she's so smart, she's funny, she's special, she's just joking around

if you were having sex with a girl who was just as good looking, you probably wouldn't give a shit about this girl, what kind of chemistry could you possibly have with a girl, that is even hesitant to give you her hand (you can get this kind of compliance from alot of girls, without even speaking to them, let alone actually having rapport, such a low level of investment on her end to turn down), what kind of chemistry could you have with a girl that isn't even willing to go on a date with you, not even to humour you?

doing this sort of thing at work when you have already had signs that she is non compliant, is just down right creepy and it's likely just going to lead towards trouble rather then sex, you're playing with fire

you're going to do what you're going to do, after all emotion is involved in this, but just as it has been posted before, keep shit professional at work, don't get all creepy and start hitting on her when she has no out, especially when she's expressed she isn't into it, but you do what you do, and don't be upset if this goes terrible for you, and she ends up trying to avoid you, or making complaints

she's already been looking for the exit, let it be, talk to other girls, and sleep with them, if you're not getting laid, the answer is not more focus on one girl who is not interested, the answer is more focus on getting laid in general and talking to as many women as it takes to make that goal attainable, if this was within your reach and easily accessable, it's highly unlikely something like this would be of a high emotional relevance to you as girls quickly lose their lustre when they waste time or do weird shit and you have better options

and on top of that, if this girl had any interest in you, she'd be trying to get that date, instead of trying to avoid it, compliance says it all

dude. i asked her out on your advice!!!! i had no intention of asking her out until you suggested it. please dont tell me i'm now being creepy....

she didnt say she had another guy, she said she liked another guy.

id screened this girl for months. i didnt enter into this lightly. i dont doubt the 15 year age gap is the problem here.

you had no intention of asking her out, well good luck with that approach to dating

asking her out = normal

obsessing over her, trying to hit on her/touch her at work, trying to make out with her at work, all after having it made clear that she doesn't even want to go out with you = creepy

you could simply be normal at work and move on, instead of doing this weird shit, and allowing her to become the center of your universe
ahh, that makes it more relevant

''wanna go on a date?''
''I like someone else''
it doesn't take months to screen a girl, you can usually make a pretty amazing guess as to if a girl will potentially sleep with you in less then 5 minutes of talking, and time is more likely to hurt your chances of sleeping with the girl, rather then help them

there's no magic sorcery to flip interest that is not there, and building a massive amount of rapport without moving things forward is an excellent way to get yourself friend zoned