This is not necessarily targeted at anyone in particular. But if it applies to you, heed my words. And yes, I would say this to your face.
1. If the guy you are dating leaves you at the bar, takes your car to your house to get his car, then leaves you locked out of your car and without a way home because he took the car and house keys with him, it is time to break up.
2. If the guy you are dating does all of #1 and then pees on your bed, it is time to break up.
3. If the guy you are dating does #1 and #2 and then tries to blame it all on your niece, who was telling him he was being a jerk to you, it is time to break up.