Does my friend's ex like me?

Yes he does likes you! Guys don't usually go through all those lengths just to mess with your head. But run it by your friend first, especially if it's a really close friend. You don't want things to be awkward. But if they weren't going out for a really long time, then there shouldn't really be a problem. Then after you get the thumbs up from your friend, just play it cool until he makes a move. Good Luck!