Sometimes it's good to fight...
"After your next screaming match, right before the makeup sex, don't bother with the 'I love you' cliché. Just tell her, 'You know, you're the only person I'd ever tolerate talking to me like that. You're that amazing.'"
Also try "If anyone else talked to me that way, I'd punch him." That should smooth things over.
"No screaming matches lately? Have one, fast. If she's screaming at you, she still gives a damn."
So, pick a fight, then use the "only person I'd ever tolerate" line. If you're lucky, your aggression followed by your condescension will make her too confused to dump you.