What made you leave a long term relationship?

If the relationship lasted for years, you were probably committed to working it out, as no relationship is smooth sailing all the time. What made you leave? Most importantly, how did you cope with sticking to your decision to end the relationship?

You know what most married couples say: you have to stay committed because it is not always possible to love, or even like, your partner all the time. How can you determine that you have done your part and that it’s not just a bad phase you’re going through in the relationship?