Hi. Welcome to PC.

I am not a psychologist but my most educated guess is that it's easier and safer emotionally to get involved from a distance with people who are a fantasy rather than a reality. People in real life have hurt you very very badly, so it must be extremely hard to trust others and get involved emotionally with others because they can hurt you.

An obsession with a celebrity is all fantasy, and therefore, cannot truly hurt or destroy you, even if you cried when you found out he was involved with someone.

The key is to get yourself to understand why you are obsessing over a celebrity crush, in order to move past it. Even if he was available and single, is it realistic to believe you two would get together? That's most likely never going to happen. But is is safe. The other key is to realize and know that not all people are abusive in the world. There are people that you can trust, that you can open up to, that you can make yourself vulnerable to who won't destroy you mentally or emotionally. But it takes time to develop trust in people again.... keep working with your therapist on this. I am curious how helpful they really are though. What does he/she say about this?