Why would my ex follow and then unfollow me on insta?

Grac44
Long story short, my ex cheated on me whilst I was away studying abroad and he blocked me on all social media when we broke up over it, I unknowing of this until finding out through a friend.

I sent him a letter to let him know that I knew what he'd done and when I got back home he unblocked me on insta telling me how sorry he was and that he regretted it, but that he could never make up to me what he'd done. And me still being deep in my feelings asked if there was still a chance for us, to which he said he was happy with who he was with at the time, so I left it and cut contact with him, this time me blocking him on insta. He still has me blocked on Facebook.

I then found out a few weeks later he had broken up with this girl and I swear I saw him in the spot we used to walk to a lot, but he ignored me, looking all angry.

Within a two weeks of this he had gotten into a relationship with another girl. And then now, a couple of months have passed and recently I got a notification that he followed me on insta with another account but then on the actual app there was nothing which means he must have followed and then unfollowed me on this other account. He had posted a selfie around the same time.

What game is he trying to play when he's got a gf? It's not that easy to hit the follow button accidentally, so what's going on?
Why would my ex follow and then unfollow me on insta?
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