Being rejected the first few times is very unpleasant but very important to go from child to adult.

You tried and you’ll get a high five from me, a complete stranger on the internet.

Seeing your crush with someone else will teach you the lesson to kill off non mutual feelings and move on. An important lesson but you did not choose to be brave and take it.

As for what feels the worst in the moment that depends on context and how many times you’ve had it happen before.