Interesting thread...
Let's face it: when it comes to maintaining friendships, many humans, both jws and non-jws, are of the out-of-sight, out-of-mind variety. If someone is not brought in front of us on a regular basis whether via the meetings, work, or whatever, we often tend to lose touch. It's the nature of human friendships, because effort is required to maintain the friendship when those people/that person is no longer right in front of us.
The OP worked hard to cultivate friendships. But it seems as though you made all the effort. It was easy for others to be your friends - just come over as invited, eat your food, hang at your house. Easy. Once you moved from the congregation, it was no longer easy for them. They certainly are not inclined to make the effort to contact you. It looks like you put forth most of the effort to begin with; it's not surprising that now they seemingly have no memory (at least in their actions) of all the things you did for them.