Answer: Because he feels good after a fight.
The awful stuff he said to you was a release. It got all that poison out of him and into you.
And let me guess—he got his way when you fought, didn’t he? Having a fight with you establishes his dominance. It puts you in your place. Of course he’s feeling good. He’s the king disciplining his subject.
He also knows that you’re feeling vulnerable after a fight. So it’s the perfect time to snuggle close and remind you how good it is with him. He knows you love him and wouldn’t leave him. This just proves it.