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I mean I always heard one person getting both so idk
I didn’t give my bf one, but no harm in doing so, it might mean a lot to him. But no, you’re not obligated to get him one too
My bf has been looking at promise rings from this website called aquamarise. They have sets for couples that aren’t outrageously expensive
You’re not “supposed” to but I’m sure he would love it
Depends on the guy too, my bf can’t wear jewelry at work so I might not
Same here, you can also just ask him. My bf’s sister’s also have them but their boyfriends didn’t get one either.