How if situation made You a Betrayer?

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I recently heard a true story from a fren of mine where she betrayed her bf.. wuikz..i was shocked when she said that, but since she is my childhood fren i got myself updated with her story. She claimed that her bf kept mental torturing her especially by saying she is a b***h & goes wif other guys.. One day she felt so fed up and just left her bf to another guy.. She hugged and kissed d 2nd guy just to be social around and not commit herself to her bf anymore..Then her bf begged her bak with him,she told him "d" story AFTER a FEW MONTHS and he addressed her as a "betrayer" and kept punishing her untill she break with him..bt then they are back together as she realised its hard to live without her bf..he still talks the past n hurts her..she feels that she is wrong and keep going with her bf even hurts beleiving one day things will be fine.. Is that suppose to be a "betrayal"? or just "nature"?