Certainly for the apologist, the activity may feel cleansing, much like a 12-step program participant may make amends for their past transgressions. But clearing that bad karma can come with a price. For the person receiving the apology, it could open old wounds that took time and care to mend. Worst-case scenario, it could cause an ex to get angry or insert him or herself into your life again. And it could cast the apologist in a negative light, considering it's a way to get the "last word" in. It's great that you feel compelled to apologize for bad behavior, particularly if you've been showed "the light" in a mature, adult relationship. But before reaching out, examine your motivations and ask yourself who the apology would benefit most. If it's you and you alone, then perhaps you should talk to someone else about your feelings – like a therapist.