Boyfriend commenting on my weight gain

My weight fluctuates awful 2 years ago I was a size 2 and now I’m a size 10 , doesn’t help having pcos and crazy nursing schedule which lead to bad eating habits, and being in a 3 year relationship I got comfortable..however I’ve been extremely self conscious about myself since I’m the biggest I’ve ever been in my life so I started to go back on keto.Tonight I was making dinner and my boyfriend looks at me and goes babe your double chin is getting very defined we both have a relationship where we joke around with each other and I know he didn’t mean it in a rude way just kinda hurt my feelings and I caused a huge argument over it. I’m beginning to think I over reacted ?? he said if I’m not happy with myself to change but he loves me for who I am 😒