Is it wrong to have a guy best friend when you have a boyfriend?

More backstory, My guy best friend is also good friends with my boyfriend. When my boyfriend and I broke up, his friend and I started talking. We got pretty close, he is like a little brother to me. He talks about his love life to me, we call and sometimes vent to each other, we are our weirdest selves with each other. Then me and my ex got back together. Im still wanting to be good friends with the other guy though. And my boyfriend is fine with that but with some boundaries as he doesn't want me and him hanging out alone or calling as much as we did. I think this is fine but it seems my boyfriend is still iffy when I bring up the fact we are good friends. I told him we are like siblings. I have no feelings towards him. And he has told me he also does not have feelings towards me. So is my boyfriend right about it being weird or is this actually no big deal?
Is it wrong to have a guy best friend when you have a boyfriend?
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