How can you have an AI relationship?
Watch the documentary Cherry 2000.
When the “relationship” is 100% dialogue, that is enough for some young or impressionable people to form an attachment.
It’s an artificial attachment, because the human is choosing what kind of responses they are likely to get. Very little is left to chance or spontaneity. A verbal robot that “speaks” with expression and enthusiasm, if you want it to.
A verbal robot that supports and defends whatever you say.
Think of it as a technologically enhanced daydream.
What AI does (by definition) is simulate human responses through a text interface.
Otherwise it tells you what you want to hear, maybe with a bit of built in censorship.
It’s essentially high-tech masturbation.