Hi
I feel you so much, Im literally in the same situation. But I know its hard to accept but, if he really loves his girlfriend he may not breakup with her. The most you can do right now I feel is just be a friend, show him that you are there for him and you care. Then that is a sure way to increase your chances with him. Like I said I’m literally 100% in the same situation. And I know it may be hard to be friends now that he has another girlfriend but you have to try. Lots of support and best of best wishes good luck!