Feeling a little undesirable

So my bf and I have been together a year and a half. For the first like 8 months of our relationship the sex was incredible. Then I gained some weight...and I noticed it go downhill from there. We've had this conversation, and he admitted that my weight gain may have had a bit of an effect on his sexual motivation. He wasn't mean or anything, I just told him to be honest with me and he was.

Now he approaches sex every time by saying "should we have sex?"

We do the same thing in bed every single time.

We don't really even make out.

He seems like he's being careful not to touch any part of my body except my boobs.

We've had this talk so many times that I want to feel more desired by him. Every time he says he'll try harder to be better, and he never does anything differently.

I try to place his hands on my ass or guide his hand downward, but he always resists me. I don't think he has every tried to pleasure me in any other way that vaginal sex, even though he says we'll try it sometime. It makes me feel like he doesn't want to pleasure me.

I'm sorry if this is a weird post. I'm feeling strange about it. Maybe I'm overthinking it. I dont want to sound like I'm focusing on sex too much, but every other part of our relationship is so good! So its just frustrating.