<human>: Long story short..I've been  my bf for about 16 months. Even though he is a great guy I don't think I can continue dating him. Lately I've been thinking about my ex ALOT(even though we haven't contacted each other in about a year), he is almost all I can think about. And it is driving me insane. My heart is almost always pounding because it makes me so anxious. I know that if my boyfriend knew what I was thinking he would be so upset and probably leave me. I kept hoping these thoughts would go away but they won't. So I think I need to break up with my current bf. Even though I don't plan on getting back with my ex. 

Anyway I don't know if I should tell my current boyfriend this because I wonder if it will make him have trust problems. I've had guys leave me because they weren't over their ex and it made me a jealous/insecure person for a long time and I don't want that to happen to him. He already had issues with my past( I had more sexual and relationship experience than him) and I fear telling him I may not be 100% over my ex may make him never trust another girl again. I usually think honesty is the best policy but I don't know if it is in this case.. what are your thoughts reddit?

Can you summarize the given text in a few sentences?
<bot>: I'm may not be over my ex, but I don't know if telling my bf is a good idea or not.