Fears of hubby leaving

Probably has to do with my PTSD from a wildly abusive childhood that somehow left abandonment issues... and the fact that I just watched the other boleyn girl...

But I've had 3 miscarriages. We want to try for more children but its more important to my husband than it is to me to have bio kids. He says he understands completely if we can't (although these miscarriages weren't related to this issue, I have a disability that can make carrying to term difficult. But they've all been unrelated genetic issues that we tested clean from)

I cant help but think, what if he leaves me for another because of this. He's shown absolutely no signs of anything, but its still hard not to think that when society bases so much importance on fertility. I'm working on it with my therapist by working on my grief and my past trauma (where my parents attempted to murder me many times, which understandably made me feel less than and unwanted)

But am I alone in this? I have no reason to think he would leave me through what he's shown. In fact he's been the most committed partner allowing me to stay home and concentrate on my health as my episodic illness is out of control.