Why does he not post any pictures of his girlfriend or status on Facebook, instagram or tiktok?

I am having a debate with my coworker. We know someone who is in a serious live in relationship. However, he has no posts of his girlfriend on tiktok, instagram or Facebook. And he never likes or comments on her posts. My coworker is a guy and says that is not unusual. I think it is odd. What is your take? You would think he is single. She posts all the time.
Why does he not post any pictures of his girlfriend or status on Facebook, instagram or tiktok?
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