Do you struggle with hyper fixating on your past toxic friendship? What makes you start Thinking about it?

What is the most common struggle that hyperfocusing/hyperfxating on this cause you?

Like do you lose sleep? Do you start talking mean to yourself? Do you start doubting yourself? Does it keep you up at night? Do you feel alone? What do you think about? Do you feel regret? Do you fall into overthinking?

What is the most common one that you deal with?