This is something i came across the other night and it really hit me.

Stop being mean, bad-tempered, and angry. Quarreling, harsh words, and dislike of others should have no place in your lives. Instead, be kind to each other, tenderhearted, forgiving you because you belong to Christ. 

Ephesians 4: 31-32 TLB

While God desires that we recognize our anger and bitterness toward others, harboring those feelings and refusing to work toward the restoration of broken relationships is contrary to His will. We need to prayerfully confront and confess inner feelings of anger, and then surrender them to the loving healing of our heavenly Father.