Boyfriend and I became official December 6th, but he won't change his Facebook yet... What's the reason?

TikiTook
I've asked him and he just says "we'll see" or "let's see how this goes for a bit first"... etc. he broke up
With his ex about 2 months ago, and he was in a relationship with her on fb and changed his status after they broke up. he's on all social media, he isn't active but he uses them daily, so it's not like he never uses it or sees the point. He does. My first thought is because he wants to keep his options open, maybe there are girls online he's talking to, I don't know. Of course I know he doesn't want to update it and if it doesn't work he'd change it right away and that looks bad to family, his ex, his friends... but I mean, it has been nearly 3 weeks since we've been official in person. I've met all his family. I don't see why he's putting it off.
Boyfriend and I became official December 6th, but he won't change his Facebook yet... What's the reason?
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