I'm going to laugh at my ex losing her job due to reasons out of her control
How did you find out about this happening?
When she called me in tears.
That's a terrible thing to do!  Imagine if the roles were reversed?  Would you want someone else laughing at your misfortune?
It has happened to me before, and besides she's only my ex.
Well even if she is only an ex it might be better to cut her off and move on with your life. Laughing at people can be really hurtful, there are so many problems that can happen if she can't get a new job.