Sorry, no part in your story have I seen that he may have been interested in you or think of you as anything but an acquaintance. He asked you to call...you didn't..he should have been the one calling if he was interested...he didn't...
This isn't even a second time around, he has clearly only been interested in hooking up with his ex. He may seem to you now to be the guy you would like to be with but not to him.
Sometimes we want what we can't have and the more we can't have it the more we want it and try and convince ourselves we are meant to be.
You are doing well with your life...keep focusing on that and move on from thoughts of this guy...someone will come around and it will be so much easier!