Definitely sounds like a red flag

That sounds like an attempt at a form of abusive control. Not wanting you to have social media is a way to control what you post and do, please be very careful and do not just delete your posts if posting makes you happy.

This is just a difference between a modern relationship and a traditional one. In a traditional relationship, your partner is absolutely justified to ask you to refrain from displaying yourself to others in a sexually provocative manner, like low-cut shirts or short shorts, because traditionally people expect each other to be monogamous and loyal. Modern relationships are very different, they are not big on monogamy or loyalty, and view this kind of attitude as needlessly controlling, because they expect cheating as a course of life. So, it depends, do you want a traditional relationship where both parties expect loyalty? In that case, then your partner is right to ask you to delete your social media. Do you want a more modern relationship where cheating is not going to be a big deal between you? If so, you can keep social media. Have that discussion with your partner, and make these decisions as a couple

Yes, it’s weird and controlling. Based on your comments, it sounds like he’s feeling insecure about other people seeing your body, and that’s something yall can discuss in your relationship but it doesn’t justify him telling you what you can and can’t post.

That’s not only a red flag, but borderline abusive. Trying to isolate you from people and keep you from other friendships. Get out now!