Just a quick question.

Your question is much to vague to give a solid answer. It really depends on a lot of things about the situation.

Read through the posts and you can see different situations and when people recommend moving on.

When you don't talk to resolve your issues, or are unwilling to keep working through them. What issues are you having?

When ending a relationship seems easier and less painful than continuing on.

When the bad times out number the good times.

When you have to ask this question.

When you're in the relationship and you're other half isn't, or that's how it feels.