Seperated but living together...

[goldeylox]

I know you weren't snooping, but dwelling on what he's doing or not doing is only going to drive you crazy. My laptop pops up all sorts of craigslist stuff too, try not to put too much stock in this event. Too soon to tell if this is a pattern.
What to do next? Focus on yourself. Journal a bit. Vent here. Paint your toes. Make a grocery list. My gut tells me do NOT confront about H's calling OW at home, at least not while you are upset. Maybe write him a note about how distressing this is for you. "On a scale from 1 to 10, my distressed feeling is (fill in the blank). You cannot control his actions, but you absolutely can choose your response. Peace.