Sarah

Have you talked with him about your insecurities? Is there something he is doing that is making you feel this way (besides talking with girls, maybe it's what or how is talks to them or how he stands when talking to them). Is there something going on with you that makes you feel this way? Are you confident in your own skin?

Have confidence in your love. Talk openly and honestly to him about it. Tell him what you need from him to make you feel more secure. Maybe it's more time together, maybe it's him introducing you to these female friends as his girlfriend or as the love of his life. Maybe hang out with him and them to get to know his group of friends. Maybe you want a text during the day to say that he is thinking of you.

I believe communication and honesty is what makes or breaks a relationship. So be confident, talk to him.

Good Luck.