Letters to the Editor
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Situational Friendships
People wind up having relationships with the folks they see daily. People have "work friends" and "tot lot friends" and neighbors they have coffee with. Once the situation changes, like a new job or Junior going off to school or schedules changing, those relationships often change. Having those true lifelong friendships come out of it is a lot like dating. You meet lots of people, but if you want it to last, you and the other person need to make the effort to sustain it in light of other changes in context.
That said, I totally understand feeling hurt. Maybe if you really like this neighbor, you can have happy hour when you get home from work. That'd give you a context to keep the regular contact going.

