Pain is inevitable in life.  Some pain, like a fire, you must avoid.  Some, like physical exercise, you must seek out (in moderation, under the supervision of a doctor).

Emotional pain is inevitable.  It comes during and at the end of almost every relationship we have.

Trying to avoid it can only be done by limiting our relationships.  Since you want those relationships, you want the pain.

The best way you can handle it is to accept that you are going to hurt, and you are going to have to endure it.  Face the pain.  Spend the day, week, or month in emotional agony.  But know that the pain will pass, and your life will find new balance.