My boyfriend (M32) keeps pressuring me (F29) to start working out again and it's frustrating me

My boyfriend (M32) of 8 years keeps pressuring me (F29) to start working out again. I am overweight but I already started doing things to lose weight such as eating better, stopped eating junk food etc and have lost 6 kilos already doing that. I feel good about my progress.

I did tell him I would start working out again, but every time he gets back from work he keeps asking me if i started already, or sometimes at random when we're having a good day he says stuff like " today would be a perfect day for you to start working out again" and it makes me feel so horrible about myself because instead of it being my choice it keeps feeling forced. I told him today and he keeps making snarky remarks like but "you promised to yourself and youre breaking that promise" like okay, but thats MY issue and not yours, it feels like control and i hate feeling like i cant start on my own terms.

how can I communicate to him that his constant pressure is making me feel controlled and actually discouraging me from starting working out again?