Am I [25] in the wrong for telling my ex [26] that dying doesn?t excuse his actions?

The title sounds bad but hear me out.
I think Ken and I broke up about five years ago. We had been together for two years, he proposed to me a month before we broke up. There were a lot of red flags that I ignored but we broke up because I found out he?d been cheating on me for almost a year. When we broke up he spread a lot of rumors about me and so did the girl, who to my face was trying to be my best friend. He stalked me for a little while when I was going to work and he?d ride by my house really slow. It was a huge clusterfk and I honestly needed therapy for a while.
The first man I ever dated, I was really really young and he was much older than me. It?s a long story itself but I caught him cheating on me as well and that stuck with me for a while. I guess what made it worse about Ken cheating was that he knew what I?d been throigh and always told me he?d never do that to me.
Anyway, it was all years ago. I really am over it but it did take a while. I?m married now, I have been for two years, and we have a beautiful baby boy together. I?m really happy. I?m in a healthy, happy relationship with a man that treats me wonderfully, we have our own house together, everything is just perfect.
A couple days ago I got a call from a number I didn?t recognize. I answered because I always answer phone calls regardless of if I know the number or not. I said hello, he said hello, I asked who it was and he told me. Then I hung up. I didn?t know why he was calling and didn?t care, I don?t have any interest at all in talking to him. Then yesterday I got another phone call from a different number. I almost didn?t answer but did anyway. It was a mutual friend of ours that I met through Ken. I had a feeling of what was about to go down but he begged me to hear Ken out and said I?d understand once I listened. I almost hung up again but I didn?t. This is the conversation:
K: I know you don?t want to hear from me but I wanted to tell you that I?m sorry for how I treated you in the past. I got a terminal diagnosis and I may have a year or less to live and I felt the need to make amends for what I did to you.
I really didn?t know what to say. I was quiet for a bit but then told him that just because he?s possibly dying that doesn?t excuse the ****ty treatment he gave. I told him I was over it and moved on a long time ago but I didn?t have much else to say, and hung up.
Now his whole ****ing family is blowing my phone up telling me I?m a diabolical person who should just grant a dying man his wish, and that it doesn?t affect me at all. Even if I?m not the bad person in this story, I?m not surprised they?re saying anything to me, they all knew he was cheating on me and were even friends with the girl. When we broke up they all acted like it was my fault and acted like they didn?t know me at all, which was kinda awkward because we live in a small town and I can?t avoid them.
I guess I could have indulged him, but I don?t think I should clear his conscience just because he might be dying. I don?t know if I even believe him in the first place. This all sounds so much worse now that I?ve typed it all out but I?ll post anyway, so, am I in the wrong?
ETA: I?ve gotten a couple people asking how I didn?t know someone was cheating on me for a whole year. He was in it for the long con, tbh. We didn?t live together and I didn?t know his exact work schedule, it varied a lot. Whenever he was with me, he?d change his wallpaper on his phone to a picture of us and change her name in his phone to his godchilds mom?s name. When he was with her, he?d change it to a picture of them and change my name instead. He was VERY private about our relationship on social media and said it was because he didn?t want everyone to know our business, and that we?d both be judged because it was an interracial relationship. I didn?t think anything of that because everyone in his personal life knew me. Well almost his entire family and friends (that I was also friends with) knew her as well and were friends with her, so they hid it for him too.
It finally came out when I begged him to let me post a picture of us on Fb and she messaged me. He?d told her we broke up a year before but that we were still friends, supposedly. That?s what she told me but I don?t believe her, there?s a lot that doesn?t add up that I won?t get into. After we broke up, she tried to be friends with me and would blow my phone up daily, so I told her to get lost and she was still the girl my ex cheated on me with and she started spreading rumors about me as well. Again, cluster****.
Just a little update.. I?ve blocked about 10 numbers and have 20+ unread texts, missed calls, voicemails, fb messages... The girl he cheated on me with even got in the mix of it and messaged me on fb (we aren?t friends, it went to the message requests) saying some colorful things. I?m going to change my number tomorrow most likely and I?ll also try changing some fb settings to see if I can prevent future messages. :/
Tl:Dr Cheating ex from 5 yrs ago called me saying he is ?dying? and is trying to make amends, asks me to forgive him. I refused and told him just bc he?s dying doesn?t excuse his behavior in the past.


Source.