How do you know when it is time to break up with your boyfriend/girlfriend?

when u know its not working. and both your needs arent being met.How do you know when it is time to break up with your boyfriend/girlfriend?
When you ask this question.How do you know when it is time to break up with your boyfriend/girlfriend?
like the first answer said.
when they hate your guts and wont talk to you anymore it's time to break-up
u just know. its usually very evident. but sometimes its not. but it all depends on the person
when things arent the same as it use to be when you first met if you suspect some if she acts weird don't want to talk to you always out late night calling peopel late at night on the phone.
When u no longer like that person, or they have abused u mentally or anyway, or when they have done something that u thing is so wrong u can't get past it (cheating)
When u start to question it, like now...
When you absolutely can't trust them, when they cheat, when they hit you, when they are addicted to drugs/alcohol/sex, when they don't let you have friends or go out on your own, when you feel like you have no life of your own any longer. Or of course, if you really don't love them, don't stay for nothing.
If you have to ask that question, it may already be time to do it. If you've already talked about what's bothering you and it hasn't helped, it may never get better and waiting longer may just make it more difficult.