boyfriend drastic weight gain

My boyfriend and I have been together for 2 years, recently he has gained 30lbs. I feel terrible about this but im not as attracted to him when we first got together. I have losed 40lbs since we have started dating and im trying to get him to get back into shape. He used to be very active but now all he does is hang around playing video games and eating junk. I love him and I put effort into looking nice for him just lately it seems like he could care less...