boyfriend and his female friend.

let me preface this with I know the opposite sex can have a totally platonic relationship. this is why I'm concerned: My bf and I hungout with his female bff 3 nights in a row. first two with her guy and then just her. we had dinner and I felt as if he was on a date with her than with me. they were sharing food he even cut up her food for her and it's a thing they do apparently. they shared dessert. it was mostly talk amongst them. I felt weird when she started talking about her sex life and things of that sort. my bf hardly looked at me and I guess he remembered I was there and asked for a kiss. ladies am I overreacting? I didn't mention anything afterwards. should I not care help