Being nice and good is not weakness. It's strength. Anyone can react, get angry and yell. No one will regret leaving that and in the long run you end up looking like "the bad person."
The friend I was describing earlier. Her husband has become so mean and bitter that even though originally she was "the cheater" and left a pretty decent guy, he has come out looking like the mean, unreasonable, "bad guy."
Don't give the x2b this type of satisfaction!!!! You only validate them and make it easier for others to support their crummy behavior.
Be so wonderful that anyone would regret not being with you. Be so amazing that no OP can compete. The x2b may not see it now, and they may push your buttons, but you get nothing from reacting... just looking weak, out-of-control and helpless.
There is no arriving, ever. It is all a continual becoming.