Should we follow our feelings?

For a long time,we heard people saying:'Follow your heart and you'll do the right thing.'

Lately I wonder about that.

For a long time(literally),I've been in love with someone,but it seems that he has two options in his sleeves; he doesn't feel the same or he's shy to say what he feels.I really wish that is the second,but what if it's the first?What should I do,with feelings for someone a little slow?Sometimes in one of those crazy thoughts I wonder if I wait,he will turn out to be what I wanted or not,if I should give a change for a really good guy who likes me,but right now I'm afraid to get involved.The point is,is right trust in our feelings when there's a chance to be wasting time and losing a really good change to do the right thing?

What is the right thing to do when you don't want hurt the feelings of someone but is hurting yours for wait the person who doesn't give a sign of life for you two?