how to assure someone that past is past?

[arhleen09]

I have a bf, we've been together for 11 months now.. nothing really bothers me but only one thing.. he nags about my past when something relates to them.. i admit a was too wild back then, but things change when he came and i become a better person now.. however, up to now he cant accept that i came to that road.. he always mentions that he feels sorry that i experience all of them and he's too late to turn back time.. i think he's scared that i would repeat it again to myself and to him, which i never imagine doing again.. it hurts me so bad, thinking the love of my life will forever make me realize the dark days of my past which i believe that he should forget and accept...my concerns about these are, how can i assure him that it wont happen and how can i make him realize that past is past??