Suspected wife cheating on me

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Hey everyone.
My wife is away for school for a few weeks. I noticed a guy (ex maybe) she used to sext in the past added her on instagram and liked her pictures.
I wanted to check her direct message inbox (i have her password) and see if they've been talking.
However, I do not want to log onto instagram with my phone at home (she is 8 hours away) because i'm afraid instagram shows your IP address and I don't want her to know it's me - i want her to think her phone was hacked or something.

My plan is then to copy any bad/suggestive pictures they've been sending eachother and email them to me (with the guy's name) and say "Hey look what me and your wife are doing haha" then bring it up to her and divorce her.

tldr:
wife cheating probably, I need a way to log onto instagram via proxy or something to check her direct message inbox. I want to set them up.