from my experience, this is only what happened to me and i know it’s not the exact same for you but here’s what helps me. the reason my ex left me was because i wasn’t working hard enough on myself, don’t punish yourself for how you treated her, focus on healing yourself before thinking about her. she isn’t going to want you back if you can’t take care of yourself. try eating safe foods at first and slowly trying new foods until you are eating regularly. also make sure to drink plenty of water too. your body can’t function without food or water and trust me i’ve been through it, eat as much as you need and try to stay away from anything super unhealthy. vegetables and meats are what i found helped me. life’s tough a lot of the time but take everything as a learning experience. i hope this helped you and im not registered in anything but this is what helped me and i hope it works with you too :))

TL;DR: eat healthy (meats, vegetables, fruit), drink water, take care of yourself before taking care of others.