Is it really important to confess your feelings to someone you like?

Do you think it is really compulsory to let the person you like how you feel about him/her?

Or we should just sit back and keep quiet about it and just keep the feelings ourselves so that the current relationship with the person will not be affected?

There's pros and cons whether we choose to tell or not to tell.

Positive results:
1) The relationship between you and him/her will be better
2) You might just get lucky as him/her had the same feelings as well so both of you decided to just couple up. Why not?
3) Nothing happens, maybe because your message was misinterpreted. Sad case.

Negative result:
1) Get rejected, but still remains as friends.
2) Get rejected, but did not contact each other anymore. This is very very bad.
3) Accepted, but this may not be a good thing because him/her might just be playing with your feelings.
4) Your confessions did not affect anything, because he/she thinks keeping the relationship currently is the best choice as he/she might not be ready for it yet.

So, what do you think?