That's a horrible story about being constantly harassed! I don't blame your feelings of insecurity and neither should your boyfriend.
You Should Be Able To Trust
But, there should be a time when you are ready to trust, don't you think?
When is that time? What can your boyfriend do for you, to help you trust him?
Talk To A Counselor
If you don't know the answers to those questions I suggest that you work with someone (a therapist, a trusted church leader, some kind of counselor) on how to get over your fears and bad feelings from the past.
You sound kind of stuck with the anxiety. Some of the issues that you are having could be in the way you two are relating. Some of the issues are undoubtedly fears and anxiety about what happened before.
You Are Not Alone
The important thing to remember is that you are not alone. There are plenty of people with special training and experience in dealing with the aftereffects of rape and abuse that can help you find the answers you seek.
It's Not Your Fault
You should know that it is not your fault! The men who are hurting you and have hurt you in the past are to blame and are truly disgusting.
I wish you the best of luck in your healing and in your relationship.