I’m struggling to eat healthy because I’m single

I’m not vegetarian but I like to eat a lot of vegetables. I need to eat healthy because of medical problems and have been quite successful when I’m in a relationship. Of course, I had a partner to share stuff with. It’s a lot more difficult when you’re single. For example, I made a big bowl of salad for the week and it turned out disgusting. It went bad anyway after a week and I didn’t eat what I could. I also don’t like cooking a lot but it’s a lot more convenient to just cook a full package of rice for myself. When I’m single, I usually end up not eating stuff and throwing it away. Or when I’m lonely, I take out. Does anyone have any tips to stay healthy and cheap while going through tough times and being single?