We all go through disappointments, setbacks and things we don't understand. Maybe you prayed for a loved one, but they didn't get well. Or, maybe you worked hard for a promotion, but you didn't get it. You stood in faith for a relationship, but it didn't work out.
Proverbs 20:24 says, "Since the Lord is directing our steps, why do we try to figure out everything that happens along the way?"
Instead of trying to find a reason behind everything that happens, one of the best things you can do is release it to God and let it go. God is directing you every step of the way. He has a way of causing all things to work together for your good. Your part is to trust and release.