I dont wanna lose "the one" help. insecure,advice?

I'm a plus size girl. I've gained a lot if weight from having kids. I'm with my boyfriend who I used to go out with many times in the past. he's the one who got away now I have him back. when. we went out years ago he was a big boy and I was 90 lbs lighter then I am now. now he's lost a lot of weight he has sexy muscles and I've gained 90 lbs, from being pregnant i have stretch marks galore, hair, and I have rolls my legs are huge. he says he likes me how I am but hasn't fully seen me I'm so insecure I don't want him to see me completely naked I can't get up and walk around naked. I'm always covering up and shutting off lights. he's saying its pushing him away and bugging him. but I'm scared if he does see me he will be scared away. his example were all skinny and pretty I'm not. I can't help it I've tried nor to be insecure idk what to do I don't want to lose him but he doesn't understand how I am and I can't. change. I do little things that are a big deal to me like keeoing some lighrs on or taking off my shirt and he does appreciate it he just says I'm suppose to do those things which I agree but still to me its big. so it doesn't help. what do I do? anybody the same?