I'd say you were overanalysing a bit too, but hey man we all do it. One time me and my girl were in my room, door shut and quite possibly about to get frisky (because of what happened next I can't remember whether or not I went through), I turned around for TEN SECONDS and when I turn around she's txting someone. No big deal I think. I went to go grab us some snacks and drinks (lol I'm the host), come back and she's gotten another txt and she's replying to this one too. The thing is though it was one of her ex's.
That pissed me off a little. I told her so too. Nothing brutal, just 'aaahahaha, don't you think it's a little rude to txt your EX BOYFRIEND while you're laying on my bed?' I wasn't overly rowr about it but I let her know I wasn't pleased.
I read a little of your following posts, and yes there is a difference of intimacy between our two situations - but bro I would have walked away too (and believe me I have). Maybe because the convo was just dry.
In summary try not to anaylse so much, but if you walk you walk and it's no biggy. Ask yourself how she would have handled had you done the same to her. If she wouldn't have liked it, feel it out and make sure it doesn't happen to you. If she says she wouldn't mind, take a step back. Sometimes these chicks honestly won't register that what they are doing is wrong, and that's a recipe for conflict of interest and unhappiness to you right there.
HR