Sometimes well meaning people do hurtful things and don't realize what they are doing. We must continue to act with grace, even when others do not act that way toward us. Someday we may need that grace. Finally, we must remember that even though other people will disappoint us, God will not. If we anchor our joy to the behavior of others, we will ride a roller coaster all our life.
People are inconsistent.
We want to live godly lives, but sometimes we look more like the Devil that we do the Lord. We must look to the Lord for our satisfaction and joy. We must have a relationship with the Lord that will still be sweet even if the entire world turns against us. We have seen this in the lives of martyrs again and again. They have gone to crosses to be burned and died singing.