Am I insane or what do I do?

So me and my ex were together for 2 years and broke up because we were arguing almost every week and he’d end up sleeping somewhere else and it just wouldn’t stop… we linked up a few months after breaking up and it was great, I felt butterflies and just like we picked up right where we left off. But my body told me no, right after us having sex I started to get headaches all the time, and disassociate a lot and I know it’s because of the exchange in energies…. Anyway. There’s this other guy and we’ve been talking or 6 months and he’s really sweet and I like him I really do but I feel like he just doesn’t treat me as good as my ex did. And I hate that I have to tell him what I’m feeling and what I want because my ex just knew….. and I know I’m gonna rekindle that relationship with someone else if I ever want it again and it’s not gonna be an overnight thing but like sheesh how do y’all stop from going back to your ex.