What would you do ,if the person whom you love, didn't know that you loved him or her? Then you would have a secret love until you told him/her about your feelings.

It is very easy to say: "Go and tell her/him about your feelings". It is true if a person is very brave. I can advise you to spend more time with her/him. If he/she likes you then you will understand her/his feelings or tell about you.

What would you do if you love him/her and do not know he/she loves you. The answer of Andeiano is logical.

What would you do, if the you love doesn't know you love him or her? To go and tell her your feelings, if she says no, then you stop losing your time thinking about her.