When you have a hectic crush on someone, and it borders on obsession, it might be 'Limerence'
This very short, fun to read book might help you identify it and get over it.

I know, I know, it feels like pseudoscience, but it will help you get over your crush either way, especially if you're married or want to de-escalate your feelings for someone, because you know that if you act on your feelings, most of the consequences will be negative...