Is it true that "sometimes love isn't enough"?

Sometimes love isn't enough. Love is, generally, at the very core of any relationship; it's a huge aspect of that relationship, but it's still one of many aspects. And sometimes love alone is simply not enough. Sometimes we love people who are simply wrong for us or even injurious to us. Sometimes we truly love but know within ourselves that we simply aren't ready for a relationship. And sometimes we distance ourselves from someone we love because we know that circumstances will separate us...possibly in 3 months.