Problem with boyfriend. What should I do?

So, here we go : I'm 19, in a relationship and there is something I'm worried about. My boyfriend has been acting differently lately. Last month everything was okay. He treated me like a girlfriend, and that's how it's supposed to be, but a week ago he started acting really strange. He's not that lovey-dovey like he was before and he treats me like I'm just his friend. Please, I need advice. What should I do?
Confront him about it
Vote A
Keep my mouth shut
Vote B
Beat around the bush and mention his behavior
Vote C
Break up
Vote D
Start acting the same
Vote E
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Problem with boyfriend. What should I do?
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