It sounds like he was both insecure and selfish.

I'm glad you stood up for yourself.

I don't think it's necessary to lose weight but if that is what you want, then your partner should show support.

Only thing - if eating out was important to him, maybe there were ways to eat out together by finding places that also had healthy options that you could have while he enjoyed going out? I'm on a restricted diet these days due to cancer, but my bf and I still eat out once in a while, but we go to places where there are options for me. If he insisted on pizza though - well, no compromise is possible.