Marriage issues

So a few months back I discovered that my husband was posting/responding to Craigslist sex ads. He claims he never acted upon them and was just needing attention. After I had our first child, I found that I have had zero sex drive. I had a traumatic birthing experience that could have ended in my son and I both dying. I have been treated for postpartum depression. Sex has been the last thing I have wanted. This is what made my husband seek it out elsewhere. I have tried to forgive him and believe him but I can’t. I’ve been victim blaming myself ever since I found this out and I can’t seem to get over it. I don’t know what to do ladies.