what do i do?..

soooo.... im gay and 18 years old. my two closest friends hate eachother..there both bisexual ones 16 and the other is 18. the 18 year old hard core flirts with me at school like hugging and kissing and sex jokes and i like the attention tbh but everytime it happens around my other closest friend i feel like he hates me for doing it abd letting it happen... should i confront the 16 year old about it or just leave it..