My boyfriend talks openly and freely with me shall I be worried?

My boyfriend talks and acts freely with me im worried does that mean he is no longer interested, like he doesn’t care how his personality looks like infront of me,.. ex: he will swear other people infront of me, he will raise his voice he acts with me like a sibling relationship I don't know how to explain but like how much siblings r comfortable doing and saying whatever…

My boyfriend talks openly and freely with me shall I be worried?
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