Hey ladies!

I(21F) with zero prior relationship experience, really need some advice and I'd really appreciate if you could help me out:)

I am planning on asking my fiance of two years if I can see his phone tomorrow for the first time during the course of our entire relationship.I have "good enough" reasons to suspect he's not being truthful.Do you have any advice on how to ask him?

Snooping isn't an option.He has a passcode on it,and I've never ever used his phone before.I don't want to snoop either.

I need to see it before I can move forward with this relationship,I just don't know how to ask him in as nice of a way as possible

I've discussed the reasons why I don't trust him in my previous posts,so I am not mentioning them again. Alot of people are asking me to either break up or to just trust him and take him up on his word.BUT I know I can't breakup if I don't know for sure and I can't move on unless I ease my mind.And I feel like seeing his texts would be the easiest way to do it .

Please offer some words of wisdom

Tl;dr I've no prior relationship experience,think my boyfriend is not being truthful and need to ask to see his phone-just don't know how to ask him