breakup

So my boyfriend of half a year and I broke up last month and we’ve still had some contact but recently we found out he was talking flirtatiously to a bunch of other girls, commenting on their pictures, and getting other girls “pictures” when I confronted him he made up a bunch of excuses and even tried to blame it on me by saying “If you made me happy you wouldn’t have had to worry about other girls” what should I do???