Javed has been disloyal to me on a number of occasions. (unfaithful, treacherous)
Jane is always critical of her friends. I do not like that. (serious, grave etc)
OK, I was dishonest with you. I’m sorry, but I didn’t want to hurt you. (lying, untruthful, fraudulent)
Breakdowns: Expressions and Collocations
Relationships can break down due to genuine misunderstandings
A rift (serious disagreement that divides people) can develop between two people
There’s been a lot of discord (disagreement and discontent) in the office lately
My father and I don’t see eye to eye (have different opinions) on most things
His relation with Mary has turned sour (become bad). I think they will split up (separate)
Our marriage has had its ups and downs (had good and bad moments), but basically we are OK
Some more phrases and their meanings:
A bumpy relationship (up and down like a car on road with bumps)
A broken home (a family split up by divorce)
A family feud (quarrel in a family causing bad feeling for many years)