Can I trust in my girl, she's saying to me that she doesn't talk with guys?

i dunno, in our first chatting, i saw in her status something about her cousin and when we're talking about something she showed me some screenshots talking with him, I think she's relaxed with him, but when we started to date she told me 'I don't talk with any boys. so I'm lliterally confused...

Can I trust in my girl, she's saying to me that she doesn't talk with guys?
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