My boyfriend takes his phone everywhere whether it’s to get water throw away a trash bag, going to the bathroom, etc. should I be worried?

He told me his password but I never try to get into his phone. Yesterday I asked him why does he do this and he said it was because of habit. He was on discord a lot yesterday i asked him if i could see and he said that the 3 hearts that i saw were from a video game review and then the next day he’s barely even answering me could he have found someone new? We’re supposed to get married soon. He’s an introverted nerdy guy could he really cheat on me?
My boyfriend takes his phone everywhere whether it’s to get water throw away a trash bag, going to the bathroom, etc. should I be worried?
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