Okay, you attacked Andrew and she pulled out divorce. How is this different? You may feel that it is the biggest stupidest thing you have done, but you apologized. You will continue with beginning DB, being nice etc. some GALs
Then she will bring it up, you will apologize when she does bring it up. You will validate her feelings. Say you are seeing counsellor to deal with it. Can't be undone, you just have to move forward. Everyone heard you when you apologized. You don't need to do it over and over.
I too am a fixer and we always want things to be better and usually right away. Yup, it's a setback, but not necessarily the straw that breaks the back. Now more than ever, you have to work on the person you want to be. The man you want your wife to see. Because whatever happens going forward, you need to travel forward. If that makes sense