Why does my boyfriend still follow his exes if they never talk?

So my boyfriend and I have been dating for 6 months. He hasn't had a serious relationship like this in well over a year to 2 years ago. He seems to have "dated" quite a few people within the last 2 years. He had a serious girlfriend of 2 years, but nothing really since then (until we started dating). When I asked/bugged him about all these other girls who he dated he said most of them were very short, maybe a month if that and when I asked him he said "none of them were that serious and none of them were tge right person" when I first met him I thought him amd I would be just a one night stand but he wanted a relationship with me and said I'm the one he wants to be with, even talks about having a child one day, but he still has a few of his exes on social media, but he doesn't talk to them ir associate with any of them, and I havnt daid anything. I don't think I have anything to worry about, but I'm not sure.

Why does my boyfriend still follow his exes if they never talk?
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