Why is crying often seen as a form of emotional cleansing, and how can it help in breaking negative thought cycles?

Ever notice when someone passes away and I’m not saying everyone, but a lot of skeletons come out about who that person really was? What’s your take?
Can a narcissist's main supply come from non-romantic relationships, like family or friends, and how does that dynamic work?
Why do I have panic attacks and feel like I'm in an alternate reality after a toxic relationship, and what can I do about it?