How do I confront my ex? Or should I even bother?

So my ex guy had been playing mind games. He messaged friends of me... Had me blocked on whatsapp, then at some point unblocked me, watched my status and a bit later apologized for the stuff that happened during the breakup after he saw a picture of me with a different guy after four months of no contact (weird coincidence, right?) - who's just a friend, I haven't dated since our breakup.
So a couple days ago he added my sister on facebook. She didn't accept the request but asked him why, as we've been broken up for a while. They talked for a bit and he basically hit on her even though he knows that she has a boyfriend. Now I'm really upset about this. Should I confront him or just let it be? I'm honestly tired of the mindgames or whatever this is, I'm just trying to finally get over him.
How do I confront my ex? Or should I even bother?
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