Why guys do this when they break up?

So my ex and I broke about a month ago, he isn't a social media kind a guy when we were together he didn't had instagram, didn't used Facebook or snapchat (only to snapchat me). Anyway the other day he opened up an instagram account and started following all these girls (girls in bikinis, pretty girls, but hoes). In the description box he put his snapchat account!! And lately he is going out to drink with his friends and girls, he also likes every photo of a girl in bikini. So my question is: Why guys do this? He loved me, our breakup was a mutual decision. Is he trying to forget me or is he reaaally moving on?
Why guys do this when they break up?
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