I lied to my boyfriend about why I do not want to sleep with him

Hello,

I am a 32(f) and my boyfriend is a 33 (m). He asked me yesterday why we don’t sleep together anymore. I told him it was due to low libido and the fact that I was on antibiotics for so long. It is actually because the last time I told him no for a good reason he would not stop trying to touch me. It felt very violating and unsafe to me. I, also, have emotionally detached because I do not really believe he wants to get married. He is all talk and no action.