How the LORD himself rebuilt friendship. Jesus is Savior Jesus Rose from the dead. Jesus Christ is central to what we believe and tell others. The LORD's friendship becoming ours. For more reading.
All people have a problem.
We aren't always good. One of the most obvious places to see that we aren't always good, and there are others, is in our anger, for each of us gets angry. For most people anger doesn't become a big problem, at least nothing for which we'd be arrested. We call that sin. Every time, not just when we're angry but every time, we aren't good we sin in God's eyes.