I'm not going to help my struggling ex and going to feel satisfied that she is struggling.
Why are you so spiteful towards your ex?
She didn't make any effort to stay together with me.
I see that the breakup with your ex was rough on you but you shouldn't be so bitter towards them. If you're not going to help them at least try not to take such pleasure out of problems they're having.
It's my life so I can do with it as I wish.
She's your ex now so how does it make any difference to you? If you're so consumed with your previous relationship it will affect you mental health. So you should find some distraction rather than finding pleasure in your ex's misery.