Rachael, I understand how you feel, but I can assure you, if he was doing the filing, he wouldn't feel one bit guilty about it. He most likely be teling folks about it. The difference between you and your h is that your moral compass is still intact as well as your empathy and compassion chips are still working properly.
Unless I am wrong, he's going to be relieved and yet angry too. He's not going to want to abide whatever is stated in the divorce paperwork, so prepare yourself for his anger and attitude.
It's time that Rachael spread her wings and fly a bit.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.