It was a well written story, starting from an interesting idea: what would you do if something really bad was said about your partner. Would believe the bad thing? Would you defend your partner declaring the bad thing a lie? Or would you, like the hero, try to find proof, one way or the other. To be open to either option? It broke their relationship, her approach, which I think is a little naive, a probable plot solution but not a brave one. I think I would be open to both being possible, the bad thing being true and the partner being worthy of love. Though perhaps I would not put my partner in the situation which would test the bad thing.
But what would I do if it was I who did the bad thing? Would I lie and hide, or would I try to understand what people thought of me?