Originally Posted by JBeaucaire
Here's how I read your question:
"I like him. He doesn't like me. Should I avoid getting involved with someone else on the off chance he might randomly change his mind and like me all of a sudden?"
No, you shouldn't avoid other relationships just because they aren't some other guy who ISN'T interested in you. That makes no sense whatsoever.
You start leading your life that way and you'll never do anything, since there will always be some other better option you'd prefer but can't have but want anyway so you don't do anything. How can you live like that?