How can I ever have my friends back? I don't know how they got angry with me! I never complained about them!

I just told them about a small problem in a project we were working on and they just ditched me. They started to tease me and started to give away my secrets. Why would they leave just because they made a mistake? It just wasn't fair. I'm not angry at the fairness problem, I'm just worried about their hatred. Help me!