Oft seen in movies — the woman who leaves the man for money; the man who leaves the woman because he refuses to face up to a challenge (or the other way round, if you are sensitive to gender issues). Sometimes experienced in a relationship. Instances abound in history, for land, country and freedom — usually ideological. In war situations; by an act of cowardice.
Most often, however, encountered with money and power; whether in a relationship, history, work or everyday life.
Betrayal, however, implies trust, did you ever think about it? Without trust there cannot be betrayal. Betrayal preys on trust. Whether intended or otherwise, the transaction that causes betrayal is the same as a transaction that causes trust; only it is in the opposite direction. This U-turn is a path of no return. Trust is never possible again. The act may be forgiven and life may continue, but trust doesn’t have nine lives. When it dies, it dies for good.
There can be no real revenge for betrayal. You cannot betray back — there is no trust left. There can, perhaps be forgiveness, but the nag remains, the walls stand taller and stronger now.
Or there is complete detachment.