Attraction to Spouse

Hello! I know this is supposed to be a men's group, but I wanted a guys perspective .

So my husband has always been a bigger guy. He has always struggled with his weight, it always fluctuates. Two years ago he got into really great shape, he looked amazing and our sex life was fantastic, his confidence was up ! But these past few years he gained all the weight back, and I love him very much and don't want to feel this way towards him. I am just finding it hard to be physically attracted to him, our sex life has gone down and I just feel he is insecure about his weight. But how do I go about telling him without hurting his feelings. I want to be supportive and encouraging, but I have tried letting him know im here and I can be his gym buddy. I've tried so many things for the past year. Nothing is working. Help