Just try to realize that how you're feeling is normal. Especially with these types of women (intense attention to you, making you feel great, then sudden withdrawal - like you don't even exist). It's psychological manipulation, and it's one they probably don't even realize they're doing. Like how a wolf will instinctively hunt and such. It's conditioning to get you to associate feeling great while around them, and getting you to know that them = feeling great. Especially when it's above and beyond what anyone else has done before for you (even worse when they're extremely attractive). But if you go against them (imagined or not), then they can literally take that away in an instant by withdrawing or being angry or whatever. Worse, you can feel directly responsible for it. Even when if you compare your actions to other people or logically can state "It wasn't that bad, was it?", and it can be truly not that bad or even insignificant. It doesn't matter. That desire to feel good with them, and that they are now bitchy with you - it must be your fault somehow.
That's where strength of mind and self-respect comes into play. You must be able to trust your own rational, and ability to step away from behaviour anomalies from her. That is where you have to trust your feeling that something is not right, and push past what you feel you want (her positive attention again). It is a hard thing to do, because logic vs emotions don't exactly mesh well in the first place.
The trick is that normal people act along similar trends (giving attention, and withdrawing), but at a much much more gradual pace, and at less extreme peaks. These girls - have a high slope up, a high maximum, and then can suddenly crash down to a low without much or any warning. It's tricky to recognize it... but you just have to look at the rate of involvement from her (fast attention, fast withdrawal). That's what I've found to be the most identifiable part, that they are not quite normal. Try to look at how fast and intense they get, and if you get the sense that it seems really fast... it probably is for good reason on her psychological part.
Example, one girl I knew for years - she'd be very interested in you and looking in your eyes, all inquisitive. Coming overtly and directly over to you. Next time I'd walk by her, no acknowledgement, no hi. Didn't seem like she was ignoring maybe, just didn't care perhaps. And this went on for years. We were just 'friends' as well. Attention seeking perhaps. Lots of other 'intense attraction/sudden withdrawal' flirtation stuff as well to add.
Anyway... I think you've just been conditioned by her, which is why you feel that desperate need to contact her and feel like things are good between you two. I understand that feeling. It sucks balls. And it's not a healthy state either. It takes quite some time to successfully recover from it. Say best case scenario. You do manage to meet up with her or just talk with her. Maybe even say great for a little while... but I think you would agree that it would get ****ty again from knowing past experiences. Maybe she'd text some other guy with supposed love right after having sex (that is still a big red flag to me). Or some other pouty/angry thing towards you.
It will restart the withdrawal process. Maybe with a bit more clarification in mind that 'Yeah, this isn't a good situation for me to be in'. Unfortunately, the real cure is separation and time away securing yourself from her. And not trying to get your fix from her to make the pain from the conditioning go away.
So you'll have to assess for yourself what is going on.
