Your husband sounds like my husband but mine says it in a joking way. I'm also the extrovert in our relationship. The difference is that my husband is seeing how hard it is to go through the surgery and how restricting it is, which has actually motivated him. He is losing weight along with me, he has removed energy drinks, and sodas. He is trying to increase his protein intake and he has lost a good amount of weight.
My advice for you is to do you hun. Write out the pros and cons if making a decision is difficult for you. The point is your decision to look out for your health is not a selfish decision it's his insecurities are the actual problem here.