Sometimes you have to weigh things. If everything else in the relationship is great, and she’s still got those photos of her ex up on social media, you might want to let your feelings go. On the other hand, after six months of dating, her leaving those photos up, after you’ve let her know you don’t like them, is a signal that she’s not that serious about the relationship she has with you.
If you want a serious, committed relationship, the six month mark is when you decide whether or not you’re going to be monogamous and committed…. if this is the only issue in the relationship, let it go. But if there are others, and this is just a sign that she’s not that into you, it’s time to move on.
