I think my boyfriend is bulimic. Please help?

My boyfriend and I have been together for about 9 months now. A few years before we started dating he was a bit on the chubby side. He started working out and got really fit and lost a ton of weight. Well...he recently started gaining it all back because of stress from his job, etc. He constantly talks to me about how fat he is, and how he's unhappy with his appearance. I tell him over and over that I love how he looks and I wouldn't have it any other way. Lately he's been eating SO much. Like, I'm not even sure how his body can hold all the food. I tell him to slow down and not eat so much, and he stops...but then later I'll see him sneak back to the kitchen to eat more. Every time he, what I can only assume is "binge eats", he tells me he's going to go take a shower. Which...it's odd he takes a shower every time he eats.

Well...one day I heard him gagging in the toilet while the shower was running. So he obviously wasn't in the shower. After I noticed this, I started paying more attention. He is puking almost every day from eating so much.

I don't know if he's puking just because he feels bad from eating so much, or if it's because he's trying to lose weight by throwing up his food. Either way, it's an eating disorder because binge eating most definitely isn't healthy.

I'm scared to address this issue, and I'm not sure what to say to him. How should I go about this? I'm really worried about him...but I don't want to make him feel like I'm attacking him or judging him. I just want him to get some sort of help.

Any advice would be appreciated. Thanks, guys.