HELP PLEASE⁉️⁉️⁉️

My husband and I have only had sex once in 3 weeks. It’s been like this for awhile now that he barely wants to have sex with me. He never asks me to do it. I always ask him. I always have to get him going. He never does me. He said somethings wrong to the point he just doesn’t feel like having sex anymore (his weight). And he told me he doesn’t get aroused by anything anymore (I believe it because I’ve worn lingerie in front of him and he kept playing his game) He promised he would change but that was months ago and nothings changed. We’re still barely having sex and when we do he doesn’t last long enough and then it’s another week or 2 before we have sex again. What do you guys suggest I do? What’s going on?

It’s not our ages we’re 21 & 23