Should I message him?

I broke up with my boyfriend recently. I already posted about it and why and it's long and fucked up so this is the post

I blocked him but he messaged me from his old Facebook. He has like 3 with pictures to "prove" this kid turned out for the better. He said he sometimes creeps on his Facebook and looks up his criminal record to make sure he's stayed in line and sent me Facebook pictures of this boys(well man. He's probably like 30 now) that he's successful and has a wife and kids and is a doctor resident now and tried to say this is why he doesn't regret it.. Because he taught that boy from a young age what happens to predators. I blocked him again but am wondering if I should reach out and let this man know that my ex Facebook stalks him. It would probably be opening up old wounds so maybe not but I know I would want to know.