gf slept with her male bsf

F(34), dating my gf (28) for 1 year. She was very honest and upfront that she slept with her guy bsf twice and I thought I was okay with that but I’m not. At first they would go out and even went to the strip club twice (she asked if that was fine, at first it was but then I told her no). Then she got rlly drunk one night after a night out with him and accidentally fell asleep while waiting to charger her phone since it died. She apologized and called me immediately after she woke up bc she knew that crossed my boundary. I met him and he’s seems respectful and chill, and I’m not threatened by him bc my gf is mostly into girls and she explained why she did what did with him which I kinda understood. But now after that incident I don’t even want her to be friends with him and I feel controlling and toxic. Not sure what to do bout this, I love and trust her sm and she’s always been honest and upfront about everything.