Is it normal that he is acting like this?
There is a guy that I have known for a couple years, and you could definitely call us friends but we aren't very close and don't hang out outside of school. We just talk and have a casual relationship. Well, last week we ended up by chance being relatively alone in a room, and he came up to me and told me I was beautiful ("so, so beautiful", to be specific). Completely out of the blue. I don't consider myself beautiful by any means, but I said thanks, because knowing his personality, it wasn't THAT weird. But then he said it again. And he was just smiling at me the whole time and staring at me. I started to feel like this was strange behavior even for him, so I said goodnight (we were both at the school for an extracurricular activity) and left. As I was walking out, he blew me a kiss!
This interaction definitely stood out as very bizarre, but I kind of forgot about it until the next day in class, when he told me again that I was beautiful, twice. The weekend passed, and I saw him today in class and he said I was beautiful again, completely out of context of anything (he pretty much just inserted it casually into the beginning of a random sentence), then ten minutes later he said I was hot, in that joking way where you can't tell if someone is actually joking. Then as I was leaving class he said he loved me.
What is going on?? I haven't been encouraging this at all or, that I know of, doing anything different to cause this attention from him. And it's not like he is being sarcastic; it all seems genuine. I really can't figure it out. And he has a girlfriend, by the way, which I had forgotten about but confirmed today. What is wrong with him/what is going on here?!