Have you spoken to your ex about the fact that your child is making "Jokes" about suicide? Parents that cannot get along (whether divorced or together) can cause a lot of stress in a kiddo's life. Have you tried having a civil conversation regarding concerns you might have over your son's possible depression? Without playing the blame game. And then try to come up with a game plan to get some counseling for your son?
My ex and I are very civil to eachother; we were even friendly for many years before this came up, but we don't hate eachother (Though I can only speak for myself). He and I don't argue, yell, blame, etc. So my son isn't exposed to any type of drama, in that regard. And yes, I did make sure to take him to a counselor because of the 'joking' about suicide, the crying and anger directed towards his dad, etc. I don't speak ill of his dad, either. Whenever my son starts saying derogatory things, I don't participate, and I stop him and just remind him that his dad and I both love him with all our hearts; that his dad is only doing what he thinks is best.
I know I made a mistake; I had a misdermeanor for driving infractions, and I obviously take blame for everything; it would be silly not to. I'm not on here wanting sympathy or recriminations. Just facts. Thanks.