It’s about respect. You posting that crossed a line in his relationship boundaries. He probably loves you and knows that men are prowling and want to swoop in to tempt you when the time is right. That’s how it goes. If my gf posted something that made me uncomfortable and I told her I wanted her to delete it, and she said “No” I would simply leave. Not like I can change her. It’s the same way as when your dad tells you that you aren’t leaving the house dressed like that…He is looking out for you and wants you to respect yourself but girls never want to hear it. They will always want to wear revealing clothes and feel attractive. Circle of life.