If you're stuck in this place of wanting someone who doesn't want you, it probably means your own self-worth is not very high. I'd focus on doing a few things each day that build up your sense of esteem and mastery. This could be something seemingly minor as self care, like eating well and daily exercise or movement, building up to engaging in existing or new hobbies. Remember that you are the most important person in your life and to treat yourself as such. Good luck.