I told my wife she was lousy in bed.
She replied, "I guess you have been seeing your ex-girlfriend, uh?"
Lousy in Bed
Explanation
Explain Bear
Listen up, buttercup. The dude insults his wife's bedroom skills, and she claps back with a sick burn, implying he's only got something to compare her to because he's been cheatin' with his ex. Ouch! Cheaters always get burned, and you would know a lot about that because you have been married five times!