Why is he so interested?

There was a guy I had a situationship with years ago, nothing serious and it only lasted a few months, anyways he has a girlfriend now of 3 years so happily settled etc and we’re just good mates. Anyways, he has a habit of constantly asking about my dating life. Last time he saw me he asked if I had found a boyfriend yet. He just came back from a holiday and the first thing he asked me was if I had been on anymore dates (bearing in mind I had told him a few weeks ago that I’m just going to stop trying and not bother anymore). I had been out for dinner a few times over the last few weeks and I had posted photos of the dinner so I get why he thought I was on a dinner date but I find it’s weird when guys ask especially when I know deep down he doesn’t care like he never really was interested in knowing until a few months ago when I said I went on a few dates with one particular guy. I just wanna know if this is normal because none of my other guy friends ask me. As a girl I like asking my girl and guy friends but I find it’s not really a topic of conversation for guys to ask…

Why is he so interested?
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