MEN! GROWN men, please answer this....?

I'm in a relationship with a man that like me, has had many relations, been married, had kids, etc.... And he's been hurt many times. HOW? How can I prove to him that I'm NOT her.... I won't hurt him in those ways. I may be rude and ignorant sometimes, but for the most part, my love is 100 % true and unconditional. We were friends before we dated. I just have ran out of ways to say it... Can someone give me advice?