Bear deserves some benefit of the doubt
I feel like Bear deserves some benefit of the doubt considering how genuinely mind-breaking the situation is. In my opinion, he’s not being malicious, but more often than not refusing to believe that all this insane magical shit is actually happening.
I think the times he sleeps with her and tries to make the relationship work are more about denial than being predatory. A lot of fucked up things have been happening in his life, and I wouldn’t say he’s in the right frame of mind to be making rational decisions.
By all means, the guy is a fucking pussy, but rather than being some evil sociopath, he just seems like someone trying to pretend that the mind breaking situation he somehow ended up in isn’t real. A lot of the events happening since he made the wish would be much easier to ignore or convince yourself didn’t happen.
Whenever possible, he chooses to believe that the supernatural things haven’t actually happened, and by the time he has no choice but to accept reality, his insecurities start to show. Is it wrong? Yes, but it’s understandable considering how traumatising an experience like this would be. She literally fed him his fucking cat, for God’s sake.
I think “she must actually be in love with me” is a much easier thing to rationalise than “my magical wish actually came true.” This plus the fact that if he doesn’t appease her she might fucking kill him leads to some difficult decisions.
TL;DR: I don’t think he’s evil just a huge coward, and the story is a lot more nuanced than Bear is simply evil.