Search Results: over the top flirting

Hi so I've been struggling with an issue I can't quite figure out. I found out when I got back with my ex boyfriend that he had slept with his old ex. On top of that, I learned he hung out with a female friend and that she had flirted with him. Automatically, I panicked thinking she was another girl he had slept with. I asked my boyfriend if I could meet her, and so when he said yes I reached out to her and she didn't reply and told my boyfriend. I let it go, as I realized my behavior was kind of weird even tho I just wanted to know the truth. My boyfriend kept telling me no they didn't do anything over the next few months, and I was still bringing her up and accusing him on and off. One day I talked to him about it and brought her up again. He asked me if I had gone and asked her if they slept together, and I said no and asked him why he said that. He responded by telling me that I had told him I was going to ask her myself in the past, and so he thought I had and also because I had been bringing her up nonstop. He said that nothing happened, that she didn't tell him I said anything, and said that she would say no if I asked her myself if they had sex. Should I believe any of this?