<human>: My girlfriend late last night asked to use my computer to do something for school, and of course I agreed. Unfortunately, earlier I'd been googling "signs your girlfriend is cheating on you" for reasons I'll elaborate on later. I went to bed, and she saw this after I fell asleep. I woke up to a horribly heart broken, depressed girlfriend. I tried to console her, let her know I love her and that I didn't think she was cheating, only that I was entertaining the possibility in my head and wanted to know one way or another. 

Backstory: The reasons I suspected she might be cheating are that the other night, after saying she'd be home around 10, texts me "Hey, I'm going to stay late at school for blahblahblah." I think, "okay, no worries here". But she gets home at 1:30 kind of drunk and it turns out she went out to a bar with her guy friend. This wouldn't bother me, had she mentioned it before. The fact that she didn't raised a red flag. (She says they went out after working on a school thing, she wasn't out and out lying about what she was doing--I don't think). 
Also, a few months earlier we had taken a break after going long distance (we live together now), and on our break she was the only one to sleep with someone else. I don't think this is evidence that she's a cheater, only that she's capable of hooking up with someone else (I'm not--I'm way too in love, the thought makes me sick). She's also admitted she cheated on a previous boyfriend after catching him cheating.

Can you condense the text into three sentences or less?
<bot>: My girlfriend looked through my browser history to find a google search, "signs your girlfriend is cheating." She most likely isn't, and now she's really upset with me.