needing advise

well some of you know that i have found somebody( a boy friend). how do you get close to somebody after you have been raped in the past. i am having problems opening up to him. he knows what i have been through and he told me not to worry about it. he told me to take my time. i am just afraid of how i will feel. has anybody else had these problems. he is the first guy that i have felt like this. i never got to close to the other guy that was out of state. if anybody has advise let me know. i was with him the last two days. last night i couldn't stay so long because i was in so much pain. the doctors have not got back with me. i am going to try to get a appointment to the doctor. another thing that made me uncomfortable today was my grandpa was talking to me about it and he was talking about birth control. i am not sure why he would say that. it just bothers me when i was alone with him. i am afraid he will say something or do something. he did say he can't touch me anymore now that i found somebody. he told me not to tell my new boyfriend.  i want to tell him but i don't know what to do. let me know what you think. i want to tell my boyfriend everything.