My 25f fiance 24m called me fat?

Tldr - my fiance basically implied that I need to lose weight with weight loss medicine so he would be able to be intimate with me on the daily, im deeply hurt.

This just happened earlier today and im still super upset about it, I keep going back and forth from anger to sadness, though I may be taking things too personally.

Earlier today my fiance (together 5 years), was telling me his company will insure weight loss medicine and so i asked him a few questions and we chatted about it for a bit. It went silent and I jokingly said well maybe I should try to be skinny. And he said you know that would be dangerous. I kept silent and he said you know why right? And I said um no why. And then he said because then id be able to throw you around and f you everyday, I wouldn't be able to take my hands off you. I immediately cut him off and said you think this is helping me right now but it really isnt. Because it straight up offended me and gave me the ick that he said that. I felt what he said had sooo many mean implications. Im not sure where to go from here, I told him it made me upset and he just stayed quiet about it for hours until I just brought it up again before he went to bed because ive been so upset about it and cant let go. He said he realized that it was an awful to say and that he was sorry and that he finds me to be the most beautiful girl in the world in his eyes. We have struggled with intimacy in the past, due to his stressful job, we went to counselling and his change of jobs has helped improve it a bit. I am at a bit of a loss as this is really hurting my self esteem. Ive felt like a shell of myself today, not wanting to shower with him. Change infront of him, let alone be intimate with him in any type of way.

How do I really truly know if this was a stupid comment or something deeper about his attraction to me? And how do I move past this resentment? How do I look past my own insecurities and not let his words bother me?