Until you know for sure, there is no point in torturing yourself. During my early 20's, with my husband, I was so insecure about our relationship, aswell as myself, and tortured my head about him being with someone else. You have to try and take him at face value.....nothing good will come out of doing your own head in about it. If it happens, you will deal with it, you really will but for now, enjoy what you have and until he gives you real cause for concern, try and put those fears aside.