Is it a red flag when a guy I've been on 5 dates with adds me on social media and doesn't accept my add. When I ask why he said he doesn't go on much?

Been on 3 dates and 2 netflix & chills with a guy and I really like him. He said he likes me and is attracted to me, but I am new to meeting people on dating apps and I don't know if these are all bad signs. I would think that if he likes me too he would add me, but now that I think of it maybe he has something to hide. Any advice? And at 5-6 dates should I ask him if he is going on dates with anyone else?

Is it a red flag when a guy I've been on 5 dates with adds me on social media and doesn't accept my add. When I ask why he said he doesn't go on much?
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