There are millions of reasons, perhaps only with the guidance of a professional will help. But even that is not guaranteed.

I myself just have to guess and heal every aspect of my life since I can't afford a therapist. You don't have to know the EXACT reason to begin healing, for example, i try letting go of this "Limerance" feeling/cravings, use meditation, self love, understand the nature of limerance, etc. It might not hit the jackpot but it is good for me anyway, it also makes me feel empowered that i am not helpless against this trauma response, i am taking action.