My sweethearts flirtatious female friend!?

I'm 32 my well i'm to old to call if boyfriend however. My b/f and I have been going on and off for almost 4 years. I broke up with him this previous August. I realized he is the one for me, and I loved him the whole time we were not talking. In that time he found his old friends from childhood, and one of them is a woman. I'm not the jealous type, at all. I trust him with all my heart, he would NEVER do me wrong. I met his friend a few weeks ago at her moms house. She didn't like me from the start. I'm a shy quiet person, and i tried reaching out and asking questions and talking to her. She always gave me one word answers, and I've seen her twice now. She never asked me anything about me. The few years he was missing from their lives, he was with me. She text him, (whats up) ""on my phone""" after not seeing him for 1 day. I know hes not messing around with her. I can never get him alone at the house. She is always there. I don't trust her as far as I could throw her. She doesn't know me and she doesn't like me because she is infatuated with him. I know if I say something to her she will deny it or won't care. I'm not saying he has to stop being friends with her, because thats not my syle. P.S. I don't fight, I'm a lover not a fighter, and I don't have the muscle for it anyways. She doesn't like me, because I'm with him. If someone doesn't like me because of my personality, or we clash thats fine, but she doesn't even know me. WHAT WOULD YOU DO? Thanks