You probably haven't said much because, like you said, you're exhausted from other fights. You know what comes from that return text that challenges his behaviour and narrative. You know it's going to be unpleasant. I'm guessing, and if I'm out of line, do correct me, but having been there, I'm assuming you just want some goddamn peace, some fucking quiet. I've done it. I've done it knowing it was wrong.
What I've learned over the years is peace at any price is no peace at all. I had to cut off my own damn son for a time.
The man you're talking to isn't your friend, he's your friend on booze. You'll pull the plug when you're ready and able. You seem like you're ready and able.