How to break up with bf

Me and my bf have had our up and downs I want to be friends with him , I don’t enjoy sex with him anymore I feel bad bc I lost my virginity to him . Idk we had fought a lot over the summer he has like tried to break up with me multiple times he has helped me healed and all I’ve found myself being attracted to other men like desiring other people I feel guilty about it I haven’t acted on it , I’m no longer attracted to him , I don’t feel good you know I feel bad for not feeling good