am i worrying about my boyfriend and other girl for no reason?

I was friends with this guy for a few weeks and there was clearly a mutual liking. He has this girl mate who he has been friends with for several years. He ditched me at least twice to hang out with this girl when we were friends. He also told me a few weeks ago that he liked her as more than friends. And then a few days after said he didnt?! She also apparently got really jealous when he got a text off me. However, we are now in a relationship and I just feel really worried. Almost all his friends are girls which I have no problem with- except this one. When hes with his friends, he always texts me- when hes with her, I get nothing at all (which i dont mind, but its always when hes with her). Hes been with her today and I havent heard from him in hours and hours. I know weve only been together a short while, but you always hear stories how someone runs off with their childhood sweetheart and because of him ditching me on a couple of occasions and not that long ago telling me he 'liked' her and ignoring me only when hes with her, I cant help but feel worried. Am i being silly?

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