Most Helpful Guy
You don't. You either trust him or you don't, but you have to respect his privacy. That's the only way to build an healthy relationship.
Think about it, even if you checked his phone daily, how could you ever be sure? He can simply delete the conversations afterwards. He can have separate accounts for other girls. He can cheat on you in a number of different ways you don't even know. You'll become paranoid thinking about it, you'll become annoying and bothersome, and you'll poison the relationship.
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