I need relationship advice.. (love triangle.)?

Try and get a stable relationship with Adam. Brian sounds like he doesn't get many women and he's scared to move on even though it would probably be the best thing for him because he needs to learn how to meet other people. You sound like you enjoy having Brian around because he's nice, but if you don't think you'll marry him, just tell him to try and move on. Try and get Adam to be more reliable and stick with him.