I agree with the ideas above -- go shopping and have some healthy foods and meals planned ahead so you don't have to do take out all the time. Once a week, we still have a fun food (Friday nights) but I still have my salad too. Pizza can be 1 or 2 slices with a salad; or I make my own healthier version on a round whole grain Pita bread.
My DH has come around and eats most of what I make now. The only thing extra he likes is "real" french fries about 1 or 2 times a month -- the last time, I still had my chicken patty and a salad: I took about 10 fries and DH ate the rest. Other times, I just have baked sweet potatoes fries instead.
Very often, I will make an alternative to what he is having; over time, this has become easier and easier. Start with small changes ... one day at a time. Also, sit down and explain to him that you are concerned about your health and want to do something about it now, and would like his support. How about suggesting healthy meals 6 nights a week and one night his choice of take-out BUT only in a limited amount. Don't forget the salad to go with it ...
If he won't go along with that; make your own meals and eat before him; then go somewhere else like your room or out somewhere while he eats by himself. On the other hand, maybe he just doesn't know how to eat healthy and he may welcome a few healthy meals, esp if you made them for him ...