I think some people are just more willing to start over than do the real work in a relationship. That is just reality. You may want this to end to but change is scary. It is very scary to take a chance rather than stay with what you have - the familiar -- even if it isn't working. Haven't you heard of people staying married for years in spite of hating each other. It's easier to know that you have a partner even a bad one. You have to decide if this is not working but it appears that you already have. If you really meant let's work on it then that is what you tell him. You have to be clear on what you want. If you don't want a divorce approach him now. If you do then you agree that it isn't working.
Use these talks to ask for what you want