Originally Posted by SNeacail
You weren't intentionally snooping. He told you to answer his phone, the text was visible, this is NOT intentional snooping.
Still, that's a crappy way to have to start a conversation. They're right though, you certainly have to be honest about what happened.
I'm a little confused though, what prompted your initial conversation about "if I'm doing anything causing you stress, please tell me about it"? Was that just a roommate type conversation where you were letting them know it's ok to talk to you? It sounds like you're really fretting about this, like your offer for them to talk to you was something deeper. Are you a little insecure about how you are relating?