<human>: Dating for just about 7 months now. Very in love with each other, blah blah all that good stuff. It's awesome. 

She recently left on a trip to Europe with 4 other students from her high school class. We don't go to the same high school, by the way. 

Anyway, leaving each other for 2 months was hard enough. But the thing is she went on the trip with an ex boyfriend that she dated around a year ago. They originally had a falling out but are back on good terms now. Good enough terms that they regularly talk and text. Sometimes in front of me. I dont make a big deal out of it, because I trust her and dont really mind all that much even if it is a bit uncomfortable. 

I always thought that *she knew* that *I knew* that they used to date, but apparently not. Before she left I was asking about the people she was going on the trip with, and she called him "an old friend". I know for a fact that this isn't true. It just kind of struck a chord with me that she wasnt comfortable just telling me that he was an ex. I dunno, I can't tell if I'm making a big deal out of it and if I don't get out of my head then I'll go crazy these next couple months. Should i talk to her when i get back? Help me get some reason reddit!

Can you condense the text into a few key points?
<bot>: she told me she was going on class trip with "friend" who she keeps in contact with, "friend" is ex.