Acknowledge Fault
A relationship is a two-way street, so there’s no need to assert where your ex was at fault, especially if you’re trying to work on getting back with your ex. However, it is important for you to take responsibility and acknowledge your own shortcomings. If there were areas where you fell short in the relationship, acknowledge them to your ex and let them know that you have and are willing to work on those areas. Also, let that person know that you’re willing to accept constructive criticism, so if you’re falling short again, they feel comfortable enough to express those concerns to you.