Should I just let it go and play dumb? I’m so tired of asking and he doesn’t stop. so I just have to accept it right?

So my boyfriend had this female friend he met online that’s a stripper and they never had sex but she kissed him and told him he had a big penis after the four week of being with each other after she did that he flew her back home. So when we got together I did go through his phone. I found things I didn’t like he told me that was his friend and that he only flirts with her to keep her sober. I still didn’t like it he told me I was controlling him and that , that is his friend and he should be able to talk to her when and however he wants. He told me he would stop but he lies about it each time.
Should I just let it go and play dumb? I’m so tired of asking and he doesn’t stop. so I just have to accept it right?
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