I have a relationship where I share almost everything with my boyfriend, but should I tell him a secret that my ex told me in strict confidence?

Anonymous
I'm in a very nice relationship with my boyfriend; we've been together for a year, and I trust him a lot. We're the type of couple who share almost everything. Now I'm at a crossroads; I'm not sure if I should tell him something about my last ex, something that no longer affects me in my daily life but was very shocking to me at the time.

My ex confessed to me after a few months of dating that he had made very bad decisions in his past, which had led him into a life of crime involving drug trafficking for almost two years. This happened when he was 19 years old, and I met him when he was 33. It had been a long time, and I was the first person he told. He managed to get out of that life because he realized it was very dangerous and harmful to himself and society. He never used drugs but was involved in that business. His job was the logistical part of the whole affair; he didn't directly engage in violent actions, but indirectly contributed, and it was something that constantly tormented him; he felt very guilty.

When he told me, I was very surprised, but I already loved him and felt I couldn't condemn him for his past mistakes. We continued dating for several months, but the people he had worked with started looking for him to ask for favors; they wrote to him, called him, and even went to his house. He didn't want to return to that world, and that's why they kept insisting. That's when I realized that no matter how much he wanted to leave it all behind, he could never completely separate himself from his past, and it was dangerous to continue with him.

It was hard for me to walk away from him because my feelings were strong; it took me a couple of months, but I finally managed to do it. I couldn't expose myself or my family to something so dangerous. It's something that happened to me, but it's also something that was told to me in extreme confidence. I'm not sure if it's something I can tell anyone else. Would it be wrong if I did?
I have a relationship where I share almost everything with my boyfriend, but should I tell him a secret that my ex told me in strict confidence?
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