

No one teaches you how to have a relationship. So people just kind of default into patterns that are often toxic.
It’s why taking a step back and being deliberate about how to communicate is so important. There needs to be a shared understanding and deliberateness about how to intentionally communicate.
And it needs to be something that applies equally to everyone involved. No copouts, no special circumstances that only go one way, there need to be firm, hard rules with specific consequences that apply evenly to all involved that are arrived at communally, and not unilaterally.
No problem.
I’ll add one other thing: Others have mentioned couples therapy. This is a great idea. Even if the relationship is already over, worst case scenario is they both gain some insight into their own toxic behavioural patterns to make their next relationship better.