Heyy Andrea.
I'm so sorry to hear this, it's a terrible thing and people are bad for doing it. If your boyfriend loves you, he will respect any decision you make regarding whether or not you are ready to have sex with him. If you explain to him what has happened, maybe it will be easier for him to understand why. However, if you choose not to, he should respect this, and if he doesn't and is forceful with you, it is wrong.
PM me if you need to. I'm sorry for what you've been through.