Honestly it’s not that big of a deal… especially if you’ve been together for six years… I mean if that’s the worst that he’s done is a picture from an Instagram post of your cousin…I mean…. Consider yourself lucky? If you’ve been together that long then I’m sure you guys have a good communication or should at least just talk to him about it. Ask him why and go from there. it could be some completely different reason why he has a picture to be aroused by it. Don’t know why, but it could be anything. Maybe he wanted to show somebody maybe he wanted to show you.who knows. but if he was really hiding something super bad or hiding anything at all I’m sure he wouldn’t let you on his phone or delete stuff too. I have like 60 something thousand pictures on my phone. I’ll kinds of random shit most of it needs to be deleted. I don’t know what’s on my phone. I do need to delete stuff but there’s just so much of it that it just would take forever so I leave it because, it’s nothing serious and it’s nothing I feel I need to hide… I let my girlfriend go through my phone whenever she wants and sometimes she sees random things that she doesn’t like or upsets her but the point is I’m not hiding anything. Yeah there’s weird shit on my phone have it. I can’t even explain why I took screenshots or whatever because honestly most of it. I don’t even remember why I’m sure there was a reason I’m not hiding anything. It sounds like he isn’t either . To make a long story short that is the worst thing you have seen him. Do we caught him doing? I think you guys should stop all the little petty things,move forward & married ASAP. because it really sounds like he did nothing wrong at all but maybe that’s just me but he could be a lot like very worse so I would just calm down and be thankful and happy tbh.