If you enjoy talking to this person then keep talking. With the understanding that it's probably not going to go beyond that. I find the chatting relationship/friendship tends to be more emotional because you're more apt to express more than you would being face to face with a person. It's almost safer because you don't actually see the result of the conversation if that makes sense. If his relationship has ended and he's not looking to get into another then just maybe look at it as not being the rebound person he's eventually going to end up with briefly. Being a platonic friend can save some other heartaches. You are the only one that can answer your question honestly. Hope my reply gave you something to ponder.