Why would a guy keep bringing this up if he’s interested?

Helloeriss01
In this class we all sit in an oval. He caught my eye quickly because he’s the main one to speak up in class always.
He usually sits across from me or diagonal. Literally everytime he opens his mouth to speak his eyes will eventually meet mine and he’ll keep glancing over at me while talking and at first it was uncomfortable because I think other people notice.
He’ll try to break eye contact with me and then scan the room or another person in his eye line while talking but he usually looks at me the most.
There’s this married guy in our class who he’s super close to. He small talks to other classmates Once he did try and talk to me before class about how it was nice to be watching a movie but I said I was gonna go call this guy. So he knows there's a guy and only after I mentioned that did he mention his random long distance girlfriend in class.
He even said long distance was a problem.
One class I talked out a lot and him and I basically had a discussion and after class he told the professor it was one of his favorite classes and I heard him.
Once he was having a joking debate and I kept looking at him and looking down and smiling and he was smiling and kept looking back at me.
I was walking to class and i saw him come out the classroom. I looked up from my phone and he was slightly smiling and looking at me so I said hi to him and I looked away but I don’t think he said anything back because I didn’t hear lol. Maybe he did.
Today I thought we were vibing! He was talking about his experience on a train and said a lady took something out of her purse and sniffed it I asked was it coke and he was like “yep you know it!” and was smiling and we’re both smiling and joking… until we were talking about cars and he mentioned his girlfriend and how she pissed an angry driver off. Lol I can’t be mad I’ve mentioned my boyfriend before but why would he mention her?
I am pretty and smart I’ve been told lol shouldn’t he be at least be attracted?
Why would a guy keep bringing this up if he’s interested?
1 Opinion