Why do I keep running into him?

Helloeriss01
There was a guy last semester. He was incredibly smart and extremely outspoken which can be a turn off for some people but I loved it. He made me want to learn more.
It was a smaller class and he always sat across from me ( we all sat in a circle ).
We would always exchange glances and while he was talking he would always look at me. He spoke out all the time which encouraged me and I said a lot of things in class. My opinion was always welcomed and after I did a presentation and he answered my questions and after it he clapped which this one guy, he didn’t clap for after.
I was smiling at him once while he was joking with someone else and he kept looking back at me and smiling. Once we were talking about this lady on a train who did coke and I guessed coke and he was like “yep you got it” and we both laughed.
I had a boyfriend and he had a girlfriend which is why I think he never made a move. Although he didn’t mention her until one day where he tried to small talk a little and I said I was gonna go call my boyfriend and after I came back he mentioned his relationship in class for the first time and how it was long distance which caused problems. Also everytime he mentioned her he mentioned how horrible her family was and how he hated them.
Also once he stopped one of his opinion rants on a novel we were reading in class and paused and looked at me and was like “weren’t you gonna say something. I think you were.”
Before class once I saw him in the hallway and we made eye contact and I said hi and he kinda smiled I think but didn’t say anything.
Now we’re back from winter break with new classes and I saw him in the hallway again while I was on the phone. He walked near me and we made eye contact and he smiled and waved at me and I did the same. Today I saw him again but he was studying and didn’t see me.
We don’t have any classes this semester but have classes in the same building. Could his smile and wave mean he’s still interested?
Why do I keep running into him?
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