I'm dating my brother's best friend. how do I tell my brother?

Anonymous
I'm 16 and he's 17 and my brother is also 17, I'm dating my brother's best friend and we have been sneaking around seeing each other because i'm afraid to tell my brother. they have been best friends since diapers. I need help on how i should bring it up to my brother? please help
Updates
+1 y
We are just sneaking around, we really care about each other.
I'm dating my brother's best friend. how do I tell my brother?
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