First of all I was NOT snooping. His phone does the same as my old Nokia, if you miss a call or the person hangs up it goes straight to the last thing you were looking at/logged into.
Anyway he was upstairs with the baby his phone was ringing, the caller hung up and it went to his last screen. It was a picture of a woman, let's just say it's a fetish thing, very posed, slightly pornographic. It was on his Instagram page. What really fucking irks me is he follows this page. If his mate had sent him it "As a laugh" ok, but he follows this shit. I feel like I really don't know him, he said he's not like that. Urgh advice pls.