Is he interested in me or should I forget about him?

A few days ago, I asked a question about how to keep up a sexual relationship with a guy living on a separate continent.

My concern was that after our make out session, he told me we should "do this again" (which, as he is a very good kisser I was inclined to do) and he gave me his very specific Facebook name. Like "here's how you spell it. Also my middle name. This is how you spell my last name. Remember it!"

Maybe I'm being dramatic (I'm a young college student, I can be that way) but we made out on Saturday (no more than that, it was that time of the month) and now it's Thursday (yes I realize it's been a few days) but I friend requested him on Facebook on Monday (once again, it's been three days) and no response.

There are a few possibilities in my mind:

1. He's a guy who just wanted to hookup, told me to get in contact with him and then didnt acknowledge me and is therefore a dirt bag

2. He was flying home the next day and school starts for him next week so he hasn't bothered to check Facebook

The only reason I acknowledge the possibility of number two is because he was so ardent about me getting his fb name right and is meeting again, which leads to

3. He meant it in the moment but then he went home and was like "that was stupid I guess I'll just ignore her" (which to all guys is also a dirtbag move, just don't pretend she doesn't exist, how rude)

Which situation is most likely and what should my next move be?

A final afterthought: during our barely clothed moments, he kept being like "you're so pretty" which I had always assumed meant he respected me more than if he had called me hot, sooooo was he still just saying pretty exclusively as a way in my pants or does that signify that he may respect me a bit?

Thank you to everyone who answers!