Why do I feel connected to him?

So there was this guy that I liked, and he liked me back a couple of months ago, anywho old news didn't work out and we stopped talking in February when he got a girlfriend. But the thing is, I still feel connected to him, even though I'm sure I'm over him. I'm not sure if I want something romantic with him, but I'm just drawn to him. I saw him again at school today, and we made eye contact for like 10 secs, and I don't know why but I felt comforted that I saw him. I also noticed that even as I walked away after that he was still looking at me, even though his girlfriend was right next to him. Like seriously the fuck.
Why do I feel connected to him?
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