Is it ok for my big brother to get angry that i’m dating his friend?

Hello so, my brother found out that i’m in a relationship with his best friend because he saw us kissing in the car and he lost his mind. He got super protective and angry and asked me to break up with him and find better guy. I love my boyfriend and he’d do anything to make me happy. I guess my brother’s out of line in this one.
Is it ok for my big brother to get angry that i’m dating his friend?
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