i think kaede is, in a sense, "in love with love" as much as or more than she's obsessed with ai. she loves the ai that exists in her head and memories (and delusions) more than she loves ai the living breathing person. which is why she wasn't interested in most of what ai had to say, or any of the feelings she had that weren't what kaede wanted to hear.
at first it felt a bit anticlimactic, but in that sense it's realistic and i appreciate it. her voice still lingers in ai's head, and it'll be a long time before ai is free of her, but she's working toward that future. building a life together with kon, treasuring her, making new memories together. she'll have to reject kaede inside her head plenty more times, but her new life with kon is giving her the courage to do that. if kaede/ai were two unhealthy people needing to satisfy their thirst and sense of lacking on each other, then ai/kon are partners by their own choice and freedom. they want to be in each other's lives, so they work toward that and prioritize it. it's a nice contrast tbh.