Bf cheated on me ..now what?

Went to the house to grab my gym sneakers and found used condoms in the his bedroom trash , we had security cameras installed for the outside ,so I looked through the foot age . My boyfriend had some girl come over last Sunday Monday and Tuesday. I need advice on what to do ... should I leave a note and say 'hope she was worth it " and leave it at that or should or blow him and bitch him out .