if you feel pressured up by your girlfriend. Like you MUST call her, you MUST do this to please her. When you're getting tired of her. When you see your girlfriend and the first thought would be something "Oh god," or "Oh no" oorrr something with those lines. Realize how you feel for her and then when you think you don't really like her, then you have to break up. I mean, its not fair for you to be unhappy ;)