Calculated To A Fault

(My boyfriend and I have just had a sort-of fight, and I am feeling very guilty as I overreacted due to unrelated stress, making it mostly my fault.)

Me: “I just hate that it’s all my fault, you know?

Boyfriend: “I’ll take 10% of the blame if you like.”

Me: “Oh, only 10%? How generous of you.”

Boyfriend: “All right, 20%, but that’s my final offer, and if you reject it, it’s back to 10%.”

Me: “…25%?”

Boyfriend: “20%.”

Me: “…Fine. 20%.”

Boyfriend: “I love you, so I’ll make it 22.5%.”