How many times in our life we look back at certain times and wonder what we could have done differently. This self-realization of what we could have done differently in the past for a better now for a relationship, job, skills keeps hitting us.
Why do we have to ponder in it and waste hours thinking about what we could have done differently?
If you can mend your relationship now, go do it. If you can acquire skills now to be a better version of yourselves, get on to it.
Things of the past should not affect our present. Time is the most precious asset of our life.