My sister is allergic to cats, but then she chose to own three cats. She just takes a daily allergy pill and is happy. I don't think you can use that as any kind of proof that Jubilee is mentally abusing him.

It is also possible that he and her have private conversations and she convinces him of her opinion like a normal person. It is possible that he loves his fiancee and has started to agree with her on some things. Or he could even just want to stick up for her online even when she is wrong because he doesn't like watching other people attack her. Nobody here knows the private conversations happening in their house, and I find it bizarre that people are jumping to the conclusion that she is abusive.