Girls, I hurt my boyfriend playing with his balls?

I'm sooo freaking embarrassed by this but when my boyfriend and I got more personal and started touching a bit, I started playing with his nuts cuz he said he liked it. But when I went to grab he yelped and curled on the floor 😭. I don't know if this happens often? And how do I sympathize with him cuz I have no idea what that is like?
Girls, I hurt my boyfriend playing with his balls?
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