Not sure if this is the right place to post it, but you guys really know how to tell the truth.

My friend is hopelessly in love with this one girl, we'll call her k. They get along really well, and he loves her. He never stops talking about her. He confessed his feelings to her, and she had almost nothing to say. She's been leading him on for quite awhile. One day, k told my friend she wants to date, but she can't because "What if someone new that she likes comes in? I don't want to be stuck with you". This was the biggest "Fuck you" anyone has ever done to him. Still, however, he loves her. What can I say/do to help him out?