i think you may just be over thinking it too much now. could it be that you started seeing this new girl too quickly after you and you ex broke it off and you never took the time to get over ur ex. if that's the case i would say you should slow it down and take a bit of a break from the new girl. this way you get it all figured out in your head and you will come back to her in the right mind set. just be open and honest with her and it should all work out. just stop over thinking everything though. that is the biggest key!