I feel like once you get into a routine of eating at home/bringing lunches to work, it makes it a lot easier to keep doing so. My DH and I used to eat out a lot when we first started dating and when we first got married, but now we hardly ever eat out. When we do eat out it's usually on the weekends. He brings a lunch every day (he drives all day long and it's not easy for him to pick up food anywhere) and I bring lunch almost every day. Sometimes I will splurge on lunch out with my co-workers.
What works for us dinner wise is quick and easy meals since I don't really meal plan. It just doesn't work for us since I never know what i'm going to be hungry for. (I usually decide dinners since DH doesn't care and is less picky than I am.) Some of my quick and easy go to meals are: spaghetti, soft tacos, grilled/air fryer chicken w/ rice and veggies, grilled meats w/ rice or potatoes and veggies (we bbq all year long), burrito bowls, crock pot pot roast, lasagna soup, potato soup, and copycat panera chicken and wild rice soup (this one takes a little longer than the other 2 soups). We also always have frozen pizzas and frozen breaded chicken breasts in our freezer. I'll also stock up on frozen lasagna when I can find the Stouffer's kind for $5 at Safeway or Raleys/Bel-Air.