How do you cope with knowing you'll never see or speak to someone again?

Anonymous
Just what the question describes. I'm not talking about someone who has passed away, but someone who is still around and doesn't want any communication with you. How do you deal? And do you feel when that person crosses your mind? I always get a sick feeling in my stomach and want to breakdown and cry.
How do you cope with knowing you'll never see or speak to someone again?
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