What do I do?

So l had a miscarriage three months ago. I have gotten to where I am now okay with it and moved on. My boyfriend has said he's okay and has moved on. We mess around and it gets close to leading up to sex but he doesn't want to have vaginal sex.

It's gotten to where I think that maybe he just isn't interested in me sexually anymore. I feel like I'm to blame for my miscarriage. But it runs in my family. Any advice?