Is it an invasion of privacy?

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Me and my fiancé are currently separated. It’s a long story and I don’t want to get into details so I’ll try to keep this short and to the point.

I asked him to move out because I’m unhappy with the way he treats me and how often he lies to me. We are supposed to be working on fixing things but I discovered he was on Tinder. His email was logged into my computer and I saw the email where he signed up. I confronted him and he has since locked me out of all of his accounts.

We are supposed to spend this coming weekend together because our daughter has an MRI. I want to ask him to look at his Facebook on his phone. I don’t want to invade his privacy but I currently do not trust him. We won’t be able to fix things and get back together until I can see that he isn’t being dishonest with me. Would it be wrong to ask him to look at his Facebook?

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