Ugh, what a sucky day you've had.
Maybe no lesson. Except maybe to appreciate that you don't have to live with it every day anymore.
I know what you mean, I got that same lump in my throat when I heard my second husband's voice on the phone years after we had both moved on. He was drunk (he only ever called if he was drunk, and if he's like he used to be he's never sober). I don't want to talk to him, don't want to engage with him in any way, but I still hurt for him. I'm glad I don't have to live with it now.