First, it's nothing to do with you; some guys avoid intimacy because they don't know how to deal with it. It's more to do with him (there's a psychology theory about attachment types - also available in a book format, PM me if you're interested) - that said, he has to sort himself out, you can't do it for him. What you can do however, is find someone who is compatible with you.

Be the person you want to date. I had a similar experience with a guy I really liked who stopped texting, gay guys seem to do this more often than not rather than being upfront with, "Hey, I'm not in a place where I can date right now, things are busy in my life," or "Hey, I really had a great time, but I don't think we're compatible". I personally think it's to do with the Grindr culture and how you ignore people you're not interested in rather than talking to them like a sane human being. It might be (pure speculation on my part), that gay guys tend to be relatively immature when it comes to relationships due to a lack of practice (more time spent worrying about coming out than learning about relationships and what is good manners). So the first take away is: guys are dicks, it's nothing to do with you. Also, this isn't Pokemon, you don't have to catch them all. It's more like fishing, you only really have to catch the one, but a lot of them are going to get away, but the fun is in the trying.

Secondly, time and distance will ease all of that as long as you put away the toys and stop beating yourself over the head with it over and over. IT HAD NOTHING TO DO WITH YOU. It was just him.

Also, if this helps, just think that he was run over by a truck and can't respond to his phone.