Bf called me another name during sex 🤬

So I got off work & went to the bar that my bf and his friend were at. His friend, his friends fuck buddy and her friend were all drinking and playing pool. I start drinking as well & we’re all having a good time. After many drinks and good times we end up going home. Mind you it’s our anniversary & we hardly have been spending time with each other due to our work schedule. So we’re home flat out drunk & we end up doing our thing. So a bit into it he called me her name. ( His friends Fuck buddies friend) . I know this girl and he knows I know her because we used to work together a while ago. So I get pissed off and just got off and laid on my side. He’s so drunk he just goes to sleep. So I go through his phone and look at the text messages between him & his friend because at this point I’m furious as fck and just can’t shake what happened. I see the convo from today and one of the text was my bf saying “ill come by if she’s there” so I’m flipping out because of what just happened with him calling her name and I see this without even thinking. So I wait till the morning to confront him not even sleeping because this just was too much for me that it made me overthink way too much. I asked him if he remembers anything like what we did & he said no. So I tell him everything and he just holds me and tells me I’m sorry that’s it. Then I tell him I went through his phone and saw that text message convo and he says he was talking about the bartender 🤦🏻‍♀️ what do I do ? Also he’s only had two encounters with her meaning like he’s only hung out with them twice already. I feel disgusted and just lost for words. Advice ???