I HATE it when people do not value what they have.
You have someone who likes/loves you so much and would do almost anything for you. Yet, you choose to go after someone who does not want to be in a relationship with you.
I understand that we cannot control our feelings.
BUT what I have a huge problem with is when you string the former person on, and then try to capture the latter AT THE SAME TIME.
You cannot eat your cake and have it. If you’ve made your choice to be with the former, stick to it. Don’t keep hurting the former all the time by constantly expressing your feelings for the latter.
At the same time, you should not make the latter catch feelings for you and then end up getting hurt because he/she knows that he/she cannot be with you because you are with someone else.
If anything, let the former go free so that he/she can at least find someone else and be happy. After all the love he/she has shown you, you should be at least that considerate.