The part nobody says out loud

Leaving is the most dangerous period, not the safe one.

Say it again, because everything you have ever been told points the other way. The weeks around a separation, and the weeks just after it, are when risk is at its highest. That is one of the most consistent findings in this whole field, and any course that tells you to leave without saying it is doing you harm.

This is not an argument for staying. Nobody here is telling you to stay, and staying carries its own risk, which does not go away by being familiar. It is an argument for one thing only, which is that if you are going to go, the preparation happens before, and it happens with somebody who does this work, and not on the night.

If you have already left, or he knows you are thinking about it, that is not a reason to panic. It is the reason to make contact with a service this week rather than next month.