Why is it hard to let go of someone who doesn’t want to be with you and showed you he doesn’t?

How to accept it and move on even when my feelings are extremely hurt and I’m still wanting to be with him…he disrespected me and became cold.. why isn’t it easy letting go

Everything I do to make myself feel good or promote change for myself I feel like I’m only doing it so he can see and come back..
Why is it hard to let go of someone who doesn’t want to be with you and showed you he doesn’t?
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