No appreciation

So today me and my fiance got in a little argument. Our son is 4.5 months old, we get married in April and he's talking about how much weight he has lost this past month while doing keto and going to the gym 6 days a week. He asks me how much I've lost... I told him nothing I'm still the same weight considering I'm breastfeeding and don't wanna diet like him 100% and can't host to the gym. He says it's my fault. He's the one that works all day, gets home goes to the gym for 2 hours and then comes home and plays video games til who knows when. I head to bed around 9 or 10. I quit my job to stay at home which is what I've always wanted to do. But a little appreciation would be nice every do often for taking care of our son. All I get is "what did you do all day" or why isn't this done, why don't you go for a run. Like taking care of our son and house isn't enough