Someone who ruins a relationship deliberately, they have an astounding level of patience, confidence and consistency. When someone has broke up with their partner and it's neither his or her fault, it's likely that they have been the victim of a relationship defacer.
Person 1: Why did you and Mel split up? You seemed really happy together.
Person 2: A relationship defacer came and ruined everything.
Person 1: I'm sorry.
Defakery is associated with the fake intentions & behaviours sometimes associated with holidays such as Christmas, Birthdays, Weddings, etc.
Holidays can involve a lot of defakery b/c they require many to suck it up & plaster a fake smile when we reallydon't feel like doing so....you know, all those things that involve defakery.