Even if you cannot change your situation or the way another person behaves, you can change your spiritual attitude.  I read a really good article about this recently and I think some of the points are very insightful, so I will share them:

1. You need to fight against your own pride in a situation that you are taking personally by remembering that you are only a delivery person for God's love letters and gifts....GOD is the whole store.  When you determine to forgive, be kind, be loving, show respect, be gentle, be faithful, show thankfulness, continue in patience....you cannot think of yourself as "THE STORE" of these things.  Every good thing you do or give to others (even when you feel they do not deserve it) comes from GOD and just passes through you.  You have chosen to deliver the things of God...not so that others will respond in the same fashion.  Their response is not your business, you are a delivery person.  If you do these loving things with the expectation of receiving in return, it will produce a poisonous pride of entitlement and bitterness in your heart.

2.  (The writer continued with the postal worker analogy for a while and I appreciated that :) He said we are not the only "postal workers" God has employed.  Our needs and the needs of others may be met on a different delivery run....we can and should let go of the pressure or let God have the burden we feel to handle everything ourselves.  Ask God to bring what you need (legitimately need) as He wills, in His timing, and in His way.  It may not be your ideal, but it will help you press deeper into God and trust in your dependence on Him. Imagine if you were delivered diamonds in a yellow box and returned them because you wished the box was red :)  God's gifts may not always come wrapped the way we think they will, but they are still delivered and they are still as precious.

3. Never stop giving of yourself.  Determine to set a positive example with your behavior and choose kindness.  There is much fulfillment which comes from being faithful if it is done in the right spirit.  Ask God to give you the humility you need to remain in this right spirit.  As you stay the course through trying times, you will grow in love rather than collapse in bitterness.

Love Letters

https://www.youtube.com/watch?v=Kde2q6RY3vM