Cool thing about roommates is you can left them drift completely out of your life until there's nothing left but anecdotes and stories. It can really suck up to that point, though...
Lol it does suck because we were pretty good friends in high-school and he's not all that bad otherwise, but this is less of an infraction on the bro code and closer to just straight up pissing all over it and then setting it on fire. He's friends with my sister too, who is also pissed at and getting cold-shouldered by him. Like I'm not saying "YOU HAVE TO CHOOSE BETWEEN ME AND YOUR GIRLFRIEND" I'm just saying when you shut everyone out that you used to be friends with because of your girlfriend maybe it's time to take a step back and think about what's good, bruh.