Confused as to why lie

Me and my “guy best friend” started to become intimate these last few months before we started to become intimate I asked him if he and his gf had broken up since I have seen her before and didn’t want to be messy and he told me yes. Come to find out they were never broken up and he told her I was the one trying to push up on him.

Last weekend we all went out to dinner for a friend bday and he completely acted like he didn’t know me and has never seen me before. should I confront him? Or keep that same energy and act like I don’t know him and keep it moving myself?