We haven't talked in over two months...

So there's this guy I met in a class and we met outside of class while doing research (art history). We met at a local museum and I had seen him before in lecture and it was always weird because we'd make eye contact all the time. We got some food after finishing our work and got to know each other better. I felt really happy and giddy and such after getting to know him because we were both completely engaged in the conversation. We really hit it off and I was really bummed out I didn't get his number. A couple of days later, he sent me a friend request and I accepted it. We started messaging constantly for a good month or so, and I enjoyed all the attention I got from this guy. He asked me a lot of questions, always asked about my well being, said goodnight (y'know generic type of bs, one tells another when 'talking'). He'd ask me sometimes if I'd like to go to his place to which I'd reply with no. I didn't want to establish some sort of friends with benefits type of thing, and after saying no we kept talking. He had told me about his casual sex encounters and his appreciation for the hookup culture. Hooking up isn't really my thing, but I have the same deal as respect for someone that hooks up and one who doesn't (it's your body do what you like, right?). Sometimes I'd hint that I really liked him by saying things like, "I really like talking to you," which he'd respond with, "What do you mean?". I think he wanted me to be straight up with him and tell him that I wanted to date him and such. I had been hoping that maybe he'd warm up to the idea of maybe dating me and eventually becoming his girlfriend or something. On finals week, we were both at different parties/kickbacks and we were messaging. We were both drunk and I had stated something about how messaging tended to desensitize people and I wanted to have a conversation with him face to face, rather than just through a phone. He agreed, but didn't think much and we moved on from the subject. Although we were very different people, we had a great deal of respect for our opinions and never antagonized each other about issues like that. After that, we began to message each other less and less. Maybe because we were both busy with classes, or maybe he came to the realization that I wanted some sort of commitment kind of deal (not marriage, but dating...) and he wasn't ready. We said our goodbyes, and I expected him to send me something once he'd get home but he never did. I'll see once in a while when he's online but I don't send him anything as he does the same.

Recently a friend of his popped up on my friends suggestions and I also got a message request from someone who wasn't my friend (he was the only mutual friend). I'm not sure if these two correlate. I tried checking who the message request was from but it had been cancelled. This girl who appeared on my suggestions doesn't go to the same college as we do, but nonetheless she appeared. I'm not sure if he mentioned me to her or something of that caliber but she looked me up.

I'm asking for advice in regards to my situation. What do you folks think of his friend popping up? A person I had never seen or even heard of appears on my suggestions all of a sudden (sounds delusional, but hey look it up!). Should I just move on and forget about him? Or if he does message me back should I respond and act as if our time apart didn't mean anything and pick it up back where we left it?

Thanks in advance!