If LW #2 is a guy, then his situation is the beginning of every romantic comedy ever made. He should talk to his neighbor, explaining the situation. She-being the independent and/or possibly wealthy free spirit that she is-will be offended and both will sling urbane insults at one another. Then there will be a moment of revelation where one will realize he/she is in love, make the feelings known to the other person and then be rejected. After a musical montage of their past encounters, they will both realize they can't live without each other, get married, and buy a house. Problem solved.