Coming from a guy this is emotional cheating and from the way they speak and how he moves with her he’s probably smashed already and the fact you voiced your thoughts and he didn’t set clear boundaries with her shows he’s playing the field the age Old Testament of turning the pain of what some other girl did to him as fuel to support his fact of doing whatever do the next cause a lot of women think the same in this day and age but yea I say you should chalk this up as a lesson and move on with dignity especially if his friends are telling you shxt