How to get over mental block

A few months ago I’ve had a scare. Since then me and my boyfriend haven’t had sex. I told him a few days ago it was because that scare we had terrified me. I know we both aren’t ready for kids. He knows it too. He told me yesterday he feels like I don’t want to have sex with him anymore. Which I insured him I did but every time we go to have sex I scaring myself and I ended stopping. I just feel like a crappy girlfriend but I don’t know how to get over that mental block that I’ve put up. I love my boyfriend so much!