Jennifer, I have an ongoing issue with this myself. My partner is just NOT interested in eating anything even remotely healthy. Our problem isn't so much that she brings in off-plan foods to keep in the house, because I do all the cooking and she hates to grocery shop; instead, it's that she always wants to order out really delicious Italian or pizza. I have identified some healthy options at each place that delivers to us, but it's still another challenge to face in making the decision to stick to the high ground. She still complains when I put healthy food in front of her, but she has no choice because I buy the food and I make the food, and I won't make her a "treat" more than once every 2 or 3 weeks.
I struggle a little with it in my own mind. She did not decide to lose weight; I did. I made this huge overhaul of my eating habits on my own, without really asking her to do it with me. I knew better than to push her or pressure her, so I decided to go the route of "influence." I am NOT going to make two dinners every night -- one fettucine alfredo with chicken, and one grilled chicken salad with minimal olive oil. Not gonna happen. I just figured that she'd be so proud of me for putting forth valiant effort that she would support me, and that as she saw my progress, she'd be influenced to modify her habits outside of my presence, not just by eating what I put in front of her. It's really a struggle sometimes, because she's a gumba from Brooklyn, who wants sausage and meatballs, italian bread and butter, breaded and fried chicken cutlets, cheesy scalloped potatoes, steak, baked potatoes with mounds of butter, steak, steak, and oh yeah, steak.
I have given her a lot of positive reinforcement, tried to ALWAYS set a positive example (so she doesn't think it's a miserable or unpleasant thing to eat healthy food,) tried my hardest to make the aforementioned healthy food appealing to her, and thanked her ad infinitum for her support. At one point (she'd brought home unhealthy food - the one and only time - Nestle Crunch Bar Ice Cream Bars....OMG! and of course I had PMS, so it was sooooo hard to stay strong) and I just sat her down and asked her to just focus completely on me in this area, to support me. I told her it wasn't fair that I was asking her to put aside her desires and freedom, but that it would be a way of really loving me and taking care of me. I just asked for her to help me. I told her that if she gave me this gift, that after I'd gotten under 200 pounds, I thought I'd be strong enough, with my good habits adequately ingrained, to withstand some temptation in the house -- and that I'd tell her at that point if I was struggling with it, and we'd work out a solution togeter. So she agreed, the sweetheart.
I do think I'm going to have to talk to her about the ordering out thing, though.....because that's happening more frequently than it used to, and it's hard on me. I also need to talk to her about giving me the time to exercise --we have exercise equipment at home and whenever she's home, it's always a big struggle getting away from her to exercise. She just does NOT want to exercise with me, AND she wants my undivided attention!

Oh, and by the way, she HAS lost some weight, and is happy about that! (Well, whatya know?

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Jennifer, I shared all of this with the thought that there might be something in my situation that might benefit you -- either a "hey, that might work!" or a "wow, note to self, don't do THAT!" I would DEFINITELY recommend talking to him, though. An open, honest, humble heart-to-heart asking for help is hard to argue with, you know? Best to you, and keep us posted on how things are going.