help me move on from this

Problem/Goal: my(25f) boyfriend(26m) of 8 years made a joke about my outie belly button being ugly. How do I move on from it?

Context: So this happened when we were showering together; obviously, we were buck naked. At first, we were making random lighthearted jokes we usually do while washing our bodies. But then, bigla niya sinabi "panget ng pusod mo" and casually laughed. I was genuinely taken aback kasi never niya na mention before na pangit yung body ko or this part which is my navel. I never laughed with him and told him I never asked for it. Tinapos ko maligo and never mentioned it again pero every time sumasagi siya sa isip ko, nasasaktan ako and I can't help but cry about it.

Previous attempts: told him twice and he even tried to have sex with me multiple times, but I couldn't, not after what he said to me.

So I told him in passing that I wouldn't have sex with him again because my belly button was ugly. He just laughed and said sorry but never brought sex up again until yesterday, when he was tipsy due to alcohol. He tried to have sex with me again, but I finally had enough and told him how hurt I was. I cried and told him how I thought back about all these years of having sex with him and now this big revelation na ganun pala pagtingin nya sa body ko. He actually cried and apologized about it, saying it won't happen again. However, what he said really hurt and hit my confidence hard. It made me feel very small and insecure, and I still think and cry about it.