Should Say I Love You Before Know One Love You Or Not

People always say we need to say I Love You when you love someone and mean it. But should you tell a person you like before she/he like you or love you.

Here is my suggestion only:

Never say "I Love You" to someone you love before sure she/he like/love you

Why?

Because she/he will only feel pressure if she/he haven't fallen in love with you.

It's difference when you say I Love You to someone love you. But maybe there are some special cases.