Sarah, I believe that relationships are self-selecting, i.e. if it does not work out then there is a good reason for it.  It does suck when the other person does the breaking up though.

Each relationship and the breakup is a learning experience for me.  It not only tells a lot about the other person but it reveals my own reaction to it.  I notice which areas of pain gets touched on, what hot buttons were pushed, and why I chose such a person for their revealed and then-hidden characteristics and qualities.

Each time I get to be more mindful about those areas of myself that need to be healed, to be paid attention to.  Relationships give me opportunities to discern more, to pay attention more, to address how I can be more compassionate… with myself and with the other.

Take care,

Mark