<human>: Summarize the given text in a few sentences.

Hi Reddit.

My bf and Ihave been together for 4 years. Today he told me he is totally sure that I had a crazy past and that I fucked a lot of guys (even that I had something with one of my girl friends). He's not mad or anything with this, he's just like 'c'mon tell me the truth'...

The problem is that I DON'T, I've been totally honest with him and told him the times I had sex (not so many...) and NEVER with a girl. 

This whole situation is making me very angry. I'm frustrated with his behaviour and I feel he's not trusting me. Obviously, I think here's the problem. He just don't believe me.

How do I handle this situation?
<bot>: My bf thinks I had plenty of sex with plenty of people and it's not true. He obviously doesn't trust me and it's really frustrating.