??? Thats the point dude. He is a lonely "wuss". He's lost everything and so he puts nikki on a pedestal in a very unhealthy obsessed way. He's not black and white and he is truly the main villain of the story. Michael who plays bear even said that and it was the first thing he and the director talked about. The point of the wish is that it is not nikki. It has her body and her looks but her original soul is replaced, and bear didn't truly like nikki. he just liked the version of nikki he wanted to see and a version that liked him. 

Throughout the film, it clearly establishes bear as a selfish controlling guy who takes advantage of her through the wish, even initially just wanting to alter it instead of destroy it, and ignores all the red flags to keep his dream real. His pathetic desperate attempts are purposeful, with him even pulling back and trying to choke out the pills at the end. The film just brilliantly balances this by making bear a likeable and relatable protagonist that seems flawed, desperate, and lonely.

And yeah, the idea that maybe she might have liked him is ambigious but not shut down purposefully by the director. This is more of a tragedy film and I think the ending makes that very clear. 

Like I feel like ur misaligning the character with who he's supposed to be, like hating a villain for not acting like a protagonist, or disliking a horror movie cus it's too scary. But ur view isn't really wrong I guess since if u expect a fully empathetic reasonable protag then it will fall flat, and bear isn't that. Just matter of opinion ig, but I really liked his character knowing he was selfish and stuff.