I just answered a question about heartbreak and how long it takes to get over it on Yahoo!Answers and it sparked a question to me:  Why do we feel like there should be a time limit on how long we mourn the death of a relationship?

When you join lives with someone, it is like you each become a second person.  You  gain a part of them and they gain a part of you.  You develop traditions, monthly anniversaries, pet names and sometimes will buy joint items, all of these things add to the memories and are tied by heart strings.  When the relationship disolves, you are forced to deal with all of the elements that were "US" and divide property, it is tough to look at all of those gifts and move on without the weekend plans and not be affected.  It is normal that you will mourn the loss of a part of your life.  And even as time moves on, you will still look back on what was, whether good or bad, and remember what used to be.

The easiest way to move on is to face your disappointments and make the best of the time that you have.  If you realize that you were impatient, jealous or had some other issues that effected your relationship, work those things out in yourself.  Mend your heart and allow your spirit to heal before pursuing another relationship.  That is what will be best for your future.  However, not matter what, take all the time that you need to move on with your life.