what the actual FUCK!

Soooo today my husband and I were sitting at his parents. I had his phone just messing around, I don't know if he didn't realize I had it or what but then I asked him why he has tumblr then I click on it and the first thing that pops up is some chick in a super low cut tang top and the deer snapchat filter. I said what the hell is this?! He goes give me my phone and got super weird. He's been acting so weird lately. It breaks my heart to think he's cheating on me but I don't know what else to think especially since if I bring it up to him he gets pissed at me and tells me to go live with my grandparents again if I don't trust him...