My girlfriend's traumatic past is getting between us... What can i do to help her?

My girlfriend was sexually molested by a guy when she was 15 and now she gets afraid when i touch her on certain spots by accident. it makes her too afraid of me and she goes into a state of anxiety which forces her to believe im trying to force her into sex. i am not asking for help so that she will have sex with me- that has nothing to do with my problem. i just dont want my girlfriend to get scared of being alone with me (especially when our "alone time" is something she begs a LOT for). it hurts me cause i feel like i get blamed for what he did to her because im a male and sometimes get a bit carried away when aroused. i have slowed down and kept my hands at spots that dont ever bother her but i get really worried and nervous when she asks me to do stuff like massage her breasts with my hands (with her thin bra as a barrier) or her stomach with my tongue because it will possibly bring back her painful memories. I want to help her get over her nightmares and fears that might end up destroying our relationship. I love her so much and i dont want her feel like anyone is going to hurt her anymore... T.T