Sorry you are feeling bad FF. There are so many of us that have been there, done that.
I don't understand what this type of men gets out of messing women around. It must just be a power trip, to blow hot and cold like that. They only want you when you don't want them, then they win you back, then they treat you badly and the whole cycle starts again.
These weird guys that seem so desperate to be with you and then, when they've got you, don't want you. You are the love of their life. They've never felt this way before, etc...... All the over the top compliments, and premature commitments, and then, later on: 'well, you're not that good looking really are you?'.... and then they gradually start to undermine your confidence and they ignore you and mess you around, treat you badly, you finish it, they win you back.
The more times you take them back, the more desperate you are to make it work so that all the heartache was not for nothing. And then it ends up with random insults: 'You're a slut / you're frigid / I never loved you / blah, blah....' By which time, you feel like you don't know who you are any more.
I'd like to think I wouldn't fall for it again, but....? I'd like to think that I would get out at the first red flag but, early on, it is so easy to convince yourself that they deserve the benefit of the doubt, and, later on, you're too attached, you've invested too much to walk away.
Look after yourself.