It is likely more than guilt and conflicting feelings. He possibly can't even think about you without being piszed off at himself, which comes out as spew AT you.
There are MLCers we come to know as "vanishers". They aren't rare, but they seem to be fairly common enough. I had one. They really would likely disappear from our lives if it weren't for the kids. With those without kids, vanishers... just vanish... sometimes for years, a LBS will only know they still exist because sometimes a mutual friend might mention them in passing.
Personally, I'm OK with my stbx not speaking to me. Mostly it was either spew or just uncomfortable, anyhow. Helped me detach.
