I have a curiosity of a certain scenario where you "yolo! self destruct!" out of the relationship due to certain reasons.

Let's say you're too emotionally invested into one girl, you don't want to play the game anymore as you may be busy with life, don't have time, it fucks with your head too much, or you feel it's better to move on. So, you tell her your brutally honest feelings (break frame), tell her you're not gonna see her again, and just get the fuck out of there. I can see, this may be used for friendzones or casual relationships.

Is this a good idea or is it better to just leave without saying anything?