Boyfriend’s phone

So my boyfriend has 2 children with someone else and we’ve been dating for about 8 months now. Throughout our entire relationship the girl has been throwing shade about him still messing with her and I’ve tried to be mature about it. I even asked both of them about it and he denied it while she said find out for myself. Tonight she posted that she had screenshots that could ruin a relationship and I feel like she’s referring to mine. Would it be wrong of me to ask my boyfriend to see his phone?

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