My boyfriend has been really starting to worry me and I’m not sure what to do or feel at this point….

We’ve always been self-conscious about our body image and etc. For him, it was being underweight and lean, and me it was being overweight and chubby at times. The past 2 months I have smoothly yet slowly got back into making efforts in trying to lose weight and while it’s frustrating and made me feel certain negative feelings I’m still motivated to try and take better care of myself. My boyfriend on the other hand…isn’t. He used to constantly tell me to take better care of myself but not himself??? I started to notice recently he’s been a bit slimmer and got me thinking, “what’s he been up to?” And that’s when I found out he hasn’t been eating as much and tends to have bad eating habits. I shared my worries and concerns to him especially what how much he’s eating can do to himself and his health, but I feel like each time I share something he dismisses it like I’m talking crap.. He made a promise to take better care of himself but when I look recently again…he hasn’t gotten rid of his eating habits……I’m worried it’ll affect the relationship and how I see him….

What should I do? Is it reasonable why I feel the way I do???