I think in relationship more responsible reason for betrayed is different and bad type mentality.
Many have some low caractet who just think using brain not from heart.Some prople also are so greedy
Also all are not same..Also in all relation ship betrayed not for justst greedy. Also have many other reason for break one relation. Or for betrayed. It can also happend by mistake.But many betrayed in real relation ship for greedy and low mentality.
I hope you got my point..