Should I write a letter of apology to an EX I hurt a long time ago?

To be honest I was debating whether or not to even ask this question on here. I'm not sure if I'm asking this as some form of cathartic writing to appease a deep seated guilt I've held on to for years, or if I'm genuinely looking to get thoughts regarding something that could be considered morally questionable, maybe both.

I'll start from the beginning. I had a girlfriend I was in a serious relationship with, we were together for about three years before breaking up. It was my fault, seriously my fault. I won't mince words, I was mentally abusive and a terrible person to her. To make matters even worse, not only did she put up with this, I ended up dumping her without even giving her any closure. This was almost twenty years ago.

For years I have always wanted to apologize to her but never had the courage to do so, with every passing year only making it easier to justify the acceptance of my guilty conscience. However, I've recently had some close calls in my life that have made me realize that I need to face my regrets, this being chief among them.

I want to write a letter of apology to her and right this wrong that I've held onto for so long, but I've heard from a mutual friend that she is married now and has children.

The truth is, if I were to write this letter I would completely acknowledge it for what it is, which is just one final act of selfishness on my part to ease my own guilty conscience. I can only imagine she's long since moved on and would hardly care to give this apology any consideration. I would also make it clear in the letter that I have no intention of ever contacting her again out of respect.

I have two choices in front of me.

In writing the letter, I would finally, and selfishly absolve my guilt and in doing so I would be disrupting her life. In not writing the letter, I will leave her in peace and continue living with my guilt.

What should I do? I will respect all opinions on the matter.

Should I write a letter of apology to an EX I hurt a long time ago?
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