My girlfriend and I were talking about fitness and I think I failed a test.

My girlfriend has gained about 15 lbs since we first met almost 2 years ago. I still think she looks hot even though it’s noticeable she’s gained . Tonight we were talking about fitness and she asked me how much I thought she needs to lose. At first I said “ however much it takes to make you happy with yourself “ . Shitty diplomatic answer I know. Then she really pushed me and I said “ ok, fine , I’d say about 15 lbs to get to where you were when we first met “. Now she’s currently upstairs whining. Where did I fuck up, and what’s my next move from here ?