Core, believe it or not, anger is not the end of the world. I have seen many marriages where there was an unhappy, "I want out" spouse, but there was no anger. There was no hate. But there also was no love. The biggest death knell for any MR is apathy. Once a spouse no longer cares, then the marriage is probably headed towards an end.
My own sitch ALMOST go to that point. My W was in the beginning stages of apathy. And once complete apathy sets in there is almost no going back.
You see Love is a CHOICE and if 2 people choose it everyday then all is good.