Try this leg posture: both of your legs lie flat on the floor from knee to foot, parallel with each other and one in front of the other (Burmese style).
If you behaved very badly with someone, you should feel regret. You should recognize your mistakes and not forget what you did, but you should also not be depressed or feel remorse. However, you should not be indifferent or ignore what you did. Learn to forgive yourself. If possible, tell the other person that you were unpleasant and ask forgiveness.
Coming back to the breath helps us discover the power of letting go and deepens our ability to relinquish mind's conditioned grasping.