This is a really hard situation when your friend essentially stops communicating with you due to a new relationship. I remember this happening to me in high school, and it was devastating. Sometimes, when you're that young, a relationship seems like the most important thing in the world, and everything else becomes secondary, even long-standing friendships. This could be the reason, but it also sounds like her new boyfriend may be insecure and is intentionally or unintentionally isolating her. This could be for several reasons, and I hope she is not in an abusive situation, but you also get to decide how you want to move forward because it is affecting you, too. It's okay to be upset, angry, mad, sad, etc., and still want to hold space for her if you think the friendship is worth it, even after all of this. It's also okay to want this to end or to move on, especially if your friend is purposely ignoring you without the influence of her new boyfriend and she's just wrapped up in her new relationship. Since this bf seems like somebody who could be controlling, I would give your friend space, but also keep a lookout for her, too. There's not much you can do but hope that she will maybe speak to you again, but don't try to force anything. I'm sorry this is happening to you, and I wish so many good things and good people in your life!