Originally Posted by Topazia
...just wondered if anyone had been poly and realised they took on too much and how they stayed with one partner after?
Poly is a squirrelly beast that's hard to pin down. Have there been polys who became monos (de facto or fully)? Absolutely.
It we zoom out just a bit, the question is essentially "has someone realised they took on too much and moved on?" People get themselves into messy situations all the time. They drag themselves out, heal, and then make new mistakes. That's part of life and relationships.
Right now he's likely hurting, and RP's advice is wise. Pain makes the brain and heart go haywire. It sounds like you're on the right track by comforting him. Allow some space, and in time you can figure out what will work for you.