From a guys perspective - what is his behaviour telling you?

I had a situationship with a guy a while back. It was really intense but it got to a point where I made the decision to cut him off, for various reasons, and told him not to contact me anymore. He still tried too, - however I ignored his last two flirtatious messages trying to reconnect, after sending me an “apology” which wasn’t really an apology.. about 4 weeks later he got a girlfriend. I also discovered he was also messing this girl around when he was messing me about. However, he had always followed my social media, but he has never once followed her back on any social media. He won’t follow her, won’t post her etc. But during the first few months of his relationship he still followed me and would continue to watch what I was doing. I had already unfollowed him prior to this. Eventually he unfollowed me. But recently I caught him viewing my stories.

I’ve been doing the inner work to heal from the situation because I did really like him however his behaviour is the reason I cut him off in the first place. When I saw him in my story views on Instagram, a year and a half after I cut contact with him, I discovered he is still with his girlfriend, however he still won’t follow her or post her on social media. It’s always her posting him. She follows him and comments on his pictures but he will not follow her back STILL. His Facebook relationship status also says “single”. Can somebody please tell me, from a guys perspective why he is actively checking up on me even though he is in a relationship? And what i’m more curious to ask, is why won’t he follow his partner? He has never had an issue following previous girlfriends in the past, but he will not follow this new girl and they’ve been together over a year.

I know I shouldn’t let it bother me but I’m curious as to what people’s opinions are about his behaviour?

Updates
9 mo
Before anyone say’s it’s childish - I understand some of ya’ll may think that, I’m just curious lol
From a guys perspective - what is his behaviour telling you?
Post Opinion