"Boyfriend" equals "auditioning for life partner". You have no commitment from him, no honesty, no reason whatsoever to stay with him. He wants to act like nothing happened-of course he does!! Consequence-free behavior is what all selfish people want. Dump him, and your friend group. Hell, move to hawaii and have an adventure! Get a new job! Get out NOW before its much costlier financially and emotionally. And get an std screen asap.