What happens in divorce when digital bullying is in play?

Both of them suffer from narcissistic personality disorder and inflated egos and a warped sense of reality. They’re a match made in heaven. Couples like this feed off of the reciprocal abuse and always get back together.

Does anybody know what is going on and can put a brief explanation, because the article has no context at all. So if the author wanted to remind people be at one end or the other of a online behavior is a problem, being informed of what is the behavior seems kind of useful.