Though my intentions are not to praise myself (May Allah forgive me) I would like to share a personal experience here. Brother, in my high school once I realized this mistake, by the grace of Allah (s.w.t) I was able to gather courage to mention to my teacher that I called that teacher bad in the teacher’s absence, but then realized my mistake. From that time on words a lot of blessings of Allah opened for me. Not only was I able to prevent myself from this sin (by the grace of Allah) but also I could sleep better and that teacher guided me in a lot of matters for years, after that incident. Still I benefit from that teacher’s advices (Alhamdulillah).
Acknowledging one’s mistake in front of a brother (through wisdom) strengthens our bond with them. May Allah (s.w.t) bless us with wisdom and courage to make the right decisions in our life. Ameen