I am on the same page, Bryan is either too scared to build anything that will last because he fears it will be ripped away from him like so many other times before, or is just aromantic guy who searches only for friends with benefits and nothing more.
Either way, he is a very interesting guy, because his route can either be a way to display in a story how a friends with benefits relationship works or how a man realizes that now things won't be swept from under his rug like before and it's safe to try and build something that will last (in this case, his first real romantic relationship).
P.S. While he has great storytelling potential, my favorite is Carlos. Then he is followed by Nate and then him.