i'm not entirely sure what connection they could have being that they don't have anyone in common and he hasn't lived there that long. maybe something random like they frequent the same cafe or coffee place and have seen each other around a lot, but never spoke. some creepy guy tries to hit on her and no doesn't seem to register, so when micah walks through the door to the place harley walks up to him all casual like "hey babe, it's about time you got here," hanging all over him until the creep leaves?