How can I lose weight in a house with someone trying to "make gains" ?

Ugh, my boyfriend is already big. But wants to get bigger, of course. His way of doing so is eating carbs carbs carbs, so much meat, and tons of shit I shouldn't be even near! I have lost a lot of weight, and when I met him I was still losing it. Then we moved in together, and I started having issues losing lbs...

He loves to cook and food shop... but its impossible to lose weight with his diet. In my perfect diet world, I would only consume 1200 cals a day in 6 small meals. most of it being fruit and veggies. Minimal meat/fat/carbs... BUT its not working that way right now.

I don't want to hurt his feelings :( he shows love through food and when im only have small portions of what he makes he really gets offended I feel bad. But I want to lose more weight! :(

How can I tell him we need to have separate grocery lists and meals? I know this is really going to upset him. But I think its fair... he wants to make gains so I will support that but I want to lose lbs so I need him to support that...
How can I lose weight in a house with someone trying to "make gains" ?
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