I have walked the preschool circuit more than once in several states. The friendships you make will likely be fleeting. People move, children grow up, circumstances change, etc. I have found that I am happier if I minimize my expectations of friendship with other parents and socialize with them only for the purpose of supporting my child’s friendships at that time. I also prioritize following the friends I had before I became a parent. Almost 20 years later, my closest friends are one of those people, not all of them. I can’t count a preschool parent among them. I wish other parents the best of luck, but just having kids in the same year is not enough reason to become lifelong friends. If this happens to you, consider yourself lucky. You cannot force a long friendship any more than you can force a lasting love.