I'm going to tell my ex that I recognized some bad mistakes I did and I'm going to tell her I'm sorry for it.
Are you actually sorry?
I don't really mean it, I just want to get her back.
Trying to get her back through dishonesty is a poor choice. I say leave it alone and move on with your life.
Why are you being so mean. I'm going to do it, I'm prepared.
If you know you made mistakes but don't really feel sorry for them then you don't really care for her. You should learn to be more mature and find someone else in your life.