When faced with these types of stories, you also need to consider your own self - worth. If the stories seem to have some truth to them and your boyfriend has betrayed your trust, you might need to reevaluate the relationship. You deserve to be in a relationship where you can trust your partner, and if that's not the case, it might be time to move on. It's a difficult decision, but it's important for your own well - being.
If you catch wind of such a story about your boyfriend, one option is to have an open and honest conversation with him. But approach it in a non - accusatory way. Say something like 'I heard this story and it's been bothering me. Can we talk about it?' This gives him a chance to explain his side of the story.