Well done for sharing your mistake. As you have learnt a lesson and shared it here, others will learn from it as well. It is sometimes very hard for others to admint their mistakes because of pride.
It's great that there is one person who is thinking the same way as I do. Everything happens for a reason and sometimes we wish that we know what reason is that but the important thing is to take every mistakes as a lessons in life. Experience is the best teacher, and I believe that every mistakes has a lesson.