Movie "Lantana": Valerie Believes that "Home Should Be a Sanctuary, not a Battleground". Why Does Her Relationship with John Break Down?

Lantana in Australia is a prickly weed that will grow almost any where. It grows like a web of thorns entangling any one who is drawn near. The movie "lantana" is exactly the same as the plant, as all the characters are 'intertwined' in some way. Valerie Somers, a character in the movie, falls victim to an entanglement of suspicion and lies which forms the battleground on which her relationship with John breaksdown. Although Valerie states herself that home should be a sanctuary, this is not evidenced in the home life she is experiencing at the moment with John. …