['My ex flaked on me again today.', 'That sucks. Why did he/she do that?', "He sucks. He was supposed to pick up our son today. I'm glad he is too young to know what happened."]
Yeah, ignorance in youthfulness is sometimes a good thing. That's really terrible of your ex, though. He should be burned at the stake.
My ex was supposed to get our son today so I could take my daughter school shopping. He flaked.