Recovering deleted texts off iPhone 4?

I'm having some issues with my girlfriend. I think she is seeing someone else. She deletes all messages every night, never let's me see her phone, and always is texting a guy from work. My question here is how can I see those deleted texts or recover them from an iPhone 4? I believe it's possible to recover them, just not sure how. I know she never plugs it into iTunes so it never syncs or anything.

It's impossible, sorry.

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