rebound girl...is she me?

so…I have a boyfriend right? ahm…yes well anyways lets start from thebeginning there was this guy I kept seeing around places stores, streets, grocery markets and such, he seemed my age…I go on my friends webpage one day and I see him on her friends list…so I click him and add him right…and so he says hello dont think I know you…and well of course I didntknow him either…so time passed by we kept talking on aim for hours…gave him my number and wed talk constantly but it was weird we would keep in touch every once in a while we wouldnt talk through text much…like wed never formally met…then he starts going out with this girl but shes non important…a month or so 3 weeks later after they break up he texts me ad says lets hang out so we do it was the first time we actually met…and well that night he hugged me and kissed me and from the start we get a long and everything is nice…3 days later he asks me to be his…and well without hesitating I accept…and so here we are now…since august 3…and hes so sweet and hes soo nice but my main concern right now…is me being a rebound! I dont want to be rebound girl…and thats what I think I am…I don’t know I mean he doesnt show like any concern over his ex he doesnt talk to her or about her…but still its just like I don’t know maybeme being emotional and paranoid…I have major self esteem issues..and I am so concerned about his ex being prettier…I feel threatened by that word “rebound…” I dont want to be a rebound but I don’t know someone tell me does it seem like I am?