How do you not get sad or feel sorry about exes?

She might struggle, she'd probably find another dude who might just take advantage of her. Most of the time, one of my reasons for leaving is that they're not self reliant. They sometimes often need someone to make them happy.

I'm sure men have left women in, possibly, worse states, such as her fending for herself (finance etc.) or even single mothers who would have to struggle. As someone who is just average in everything, this makes me want to go back because it feels like the emotional and physical company can at least give a boost as to how shitty life can sometimes get.

But then again, I know I can have more fun being alone and single. How do you not let your exes affect your mental health?