How did you know when it was time to end a relationship?

[ThetaLove]

Of course the obvious reasons are clear: cheating, abuse, smelly feet, etc.
Ok so I'm kidding on the smelly feet part....
But is it just one of those situations where if you are wondering or asking the question of whether or not to end it, you already know the answer?

I'm great at giving other people advice. But terrible when my feelings are involved.

edit: grrrrrrr. you can all point and laugh at me for not doing a search before posting.... I just noticed a similar thread.
but feel free to respond if you wish.