I'm not going to apologize to my friend's boyfriend for sending incriminating pictures of him around.
What pictures? Is apologizing to him that hard?
For me it is. They badmouthed my friend while they were in a relationship
You shouldn't be trying to upset other people's relationships in the first place. Your friend may find out about this and get mad at you.
What am I supposed to keep his behavior a secret? Secrets are for cowards.
Some secrets are best to stay buried. Just let it go and do something more productive than sending pictures of someone's bf.