I understand that it can be incredibly painful to have feelings for someone who doesn't reciprocate them, especially when they are involved with someone else. It's important to prioritize your own well-being and work on letting go in order to heal.

1. Accept your feelings: It's okay to feel sad, hurt, and miss her. Allow yourself to acknowledge and experience those emotions fully. Don't try to suppress or ignore them, as it may lead to further pain.

2. Focus on self-care: Engage in activities that bring you joy and fulfillment. Take care of yourself physically, emotionally, and mentally. Exercise regularly, eat well, spend time with friends and family, pursue hobbies, and indulge in self-care rituals that make you feel good.

3. Create distance: If possible, minimize contact with her to give yourself space and time to heal. Seeing or interacting with her regularly will only prolong your pain and make it harder for you to move on. Limit your interactions to necessary circumstances only.

4. Seek support: Reach out to trustworthy friends, family members, or a therapist who can provide support during this difficult time. Talking about your feelings, fears, and frustrations can help you gain perspective and find healthy ways to cope.

5. Let go of unrealistic hopes: Accept that she has chosen someone else and that you cannot force her to feel differently. It's crucial to acknowledge that you deserve someone who reciprocates your love and desires to be with you.

6. Redirect your focus: Instead of dwelling on thoughts of her, redirect your attention towards your personal growth and self-improvement. Set goals for yourself, invest in your passions, and work towards becoming the best version of yourself.

7. Give yourself time: Healing takes time, and everyone's journey is different. Be patient with yourself and allow the healing process to unfold naturally. Understand that it is normal to experience ups and downs, but as time goes on, the pain will gradually fade.

Remember, you deserve love and happiness, and by taking these steps to heal and move on, you are opening yourself up to new possibilities and the opportunity to find someone who truly appreciates and values you.