Why can’t I take care of myself?

I was in a relationship for almost two years and during that time I was able to take care of myself plus my boyfriend. I.e. make us both food 2-3 times a day, do our laundry weekly, clean the apt, go grocery shopping and groom myself. Since we’ve broken up and he’s left the apt I can’t do anything. I eat once a day, I wake up around 10am but I can’t get out of bed and I usually end up eating around 7pm if there’s food. If there’s no food it’s a battle to go to the store. if I’m not working i don’t shower and I don’t groom myself. I used to live this lifestyle before I was with him. It seems like I don’t have the energy to take care of myself unless I’m taking care of someone else as well. Why?? I need to break this. It’s like I want to but I have no energy to do it just for myself.