Do guys introduce their girlfriend to their friends?

We have been dating for a few months now. But he hasn't introduce me to his friends and my close friends already know about him since we started dating. When i asked him about it, he just said he doesn't want to get questioned about our relationship. When he's at his friend's house, he rarely text me. I don't know why but it's like he doesn't want his friends to know I'm exist. It's like I'm a secret. What should i do?
Do guys introduce their girlfriend to their friends?
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