D., I'm proud of you for moving on, and there's nothing wrong with wanting things to be set right, even if just emotionally.
When I was graduating from college, my longtime BF and I broke up (his doing) and I was crushed. I started dating someone else, whom I'd been attracted to for a long time. That guy was wonderful in every way, but it became clear to me that he wasn't "the one." I knew he was falling hard for me and I told him I loved him. I was stupid and I meant I loved him as a friend, but what he heard was "I love you" which was literally what I said. I was too cowardly to take it back, so I convinced myself that it might be love. But I knew better.
Long story short, the ex and the new bf both proposed to me on the same day. I was such a coward that I said no to both of them, told neither I was still seeing the other, and didn't have the strength to just leave them both and let them get on with their lives.
I ended up getting back together with the ex and finally stopping seeing the other guy, but still insisiting on remaing friends, which we had been for years. He didn't want that and he kept proposing. He finally said that I hurt him so much that he never wanted to hear from me or about me again.
It took me YEARS to admit the wrong I had done. The second guy actually wrote a book about how much he hated me. 168 pages. I admitted it only to myself, because neither of they boys cared to speak with me again after the way I had played them. I don't blame them. It's been about 15 years and I still wish all the time that I could apologize for my actions, but I was asked all those years ago never to contact him again, so at least I've respected that.
Yes, remorse happens. In the end, my remorse wouldn't change a thing for those two lovely men but I do wish them peace.