Another one down

Tonight was just yet another daily arguement. Asked him to explain why a girl messaged him saying I really like that photo. And no ladies I didnt go through his phone it was sitting next to me and it popped up on the screen. Also add that I guess he changed his password on Saturday. Which I only found out cause I left my phone in the car and went to use his to call mine. And I just let that go.. but tonight I didnt yell and I didnt accuse and didnt ask to go through his phone, I simply asked if he had any sort of an explanation, seeing as I'm friends with him obviously and he hasnt posted a new photo in a looong time. He freaked out on me and tried to turn it on me.. instantly started yelling and calling me names saying I'm being immature and saying I disrespected him. I stayed calm because if I start yelling he gets even more mad. He ended up storming off and is now sleeping on the couch. Which that's fine. I'm not even upset. I get then entire bed to myself lol. I cant force someone to be loyal and I'm not gonna try. But I will not be "building my life" with someone who I cant trust.

I guess I'll add that this girl is not someone I know at all.. never heard of her and we have been together 2 years and living together for a year. And he works at an all male job except for the boss's wife , who's wayyy older. so it couldnt be a coworker. I'm not saying he cant have girl friends but I just dont know this "FRIEND". And if it was just a friend thing I feel like his reaction was just extremely weird for it to be something that was appropriate.