WHOA. Red light! Red light! This big-headed jerk called you insecure, then started dating your close friend? First of all, that doesn't sound like a very good friend, but I understand that things get complicated. However, to say you were insecure, then have him act on the very thing that you were insecure about to begin with makes him sound like a bag that starts with a D. Don't blame yourself. This is his problem. Quite frankly, I think you should roll your eyes and flip him the bird. Of course it hurts your feelings; that was an awful thing that he did, but understand that it isn't your problem, it's his. He sounds like he's being very immature. If I were you, I'd give him the cold shoulder. In fact, I'd probably take a break from that friend as well. Do something for YOU, take a break, focus on a hobby. Insert yourself into a group of people (or hang out with an individual) who is/are low-key, and drama free. I don't want you to feel bad about a problem that you can't help. If you can't change it, then do something you can change; help yourself. Ignore guys like him; they aren't worth pursuing anyway. Do something with your time that IS worth pursuing and that puts a smile on your face. You're worth that smile. :)