Jesus says that if you live for him that He will take care of everything else, including the people who are making your life miserable. Living for Jesus is not always easy, it is full of suffering and riducle, but look at the suffering and judgement that He went through just to save you and me. It is important to remember that God will bless you eternally as long as you obey His commands and although it doesn't seem like it He is sovreign through all things ecspecially this situation. It is not for us to understand why these things occur but it is important to trust and have complete faith in His Sovreingy for our lives. One of the important themes in Mark is suffering. Jesus said if we want to follow Him we must endure suffering.
"For even the Son of Man did not come to be served, but to serve, and to give his life as a ransom for many" Mark 10:45
"For my thoughts are not your thoughts neither are your ways my ways declares the Lord. As the heavens are higher than the earth, so are my ways higher than your ways adn my thoughts than your thoughts." Isaiah 55:8-9