Between this Josh guy bragging about how he's taken girls off other guys, and her feelings for him, past or present (plus dreams, strange behaviour etc). I fear the writing is on the wall my friend... No disrespect to her, but in my experience people are alot better at hiding their feelings than we'd like to believe. Are you paranoid by nature? If not, chances are you're on to something. Whether anything has actually 'happened' or not, it's the intent that matters in my opinion. In engineering opportunities to be alone, it seems to me that the intent is there.
I haven't read all the above posts end to end either, so apologies if I've missed a vital piece of the puzzle, just saying that usually your senses won't be far wrong man.
Hope it works out dude...
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