What does it mean if me and my male friend text for more than 1 hour?

We had text so much and the conversation never gets dry. We call each other friends, but some days we friends, somedays we act like couple and some others we discuss about shows that we like, we call each other nicknames all the time, some times we even flirt but we still friends. Are we just friends even if we call each other friends?

What does it mean if me and my male friend text for more than 1 hour?
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