LTR seemingly seeks validation through social media.

Any advice to deal with a LTR that seems to look for attention and validation from other guys via social media? I'd prefer to not just "next" her like a lot of the advice on here states, but I'd like some feedback. Recently, I sat her down and told her that it seems to me that she is using social networks to solicit validation from other dudes and it slightly unnerves me, because we're in a relationship. It's not jealousy I feel, its more of a lack of respect. And some other info; she doesn't post half naked pics or crave likes or anything. She just sometimes puts up questionable vague posts and shady guys are obviously making moves into her private messages.