Mental blah

I know that he is faithful and I trust him I just don't trust his female friends. Mainly the ones that make me feel like they are disrespecting us and our relationship. In my mind who would saw "if you weren't with her " and bite her lip. And she said it when I was around. I feel useless when she's around and like I'm not good enough. I don't know what to do. I've talked to him and tried to explain I just don't like feeling this way any tips to help me get over it