Can I track messages on my wifes phone?

I found out my wife is having a cyber affair I told her to stop and she still continues. I’m thinking of Devorce so I want to track her messages on her phone. The phone plan is under my name and so is the phone. In a court of law do I legally own the phone and am I able to track her messages to use as proof of the affair. Can she take any legal action against me since technically she is using my phone.

Thank you for any insight
Jason

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