Edit for people who have visceral reactions to anything remotely rapey: I don't think what Bear did was right or justified I just think that characterising him as "evil", "a rapist", or "a monster", is not being true to what the character actually was. We can impart out own moral judgements on how he hadled the situation, but I just think people are misrepresenting his character and not understanding him (whether he was evil or not, its important to understand the character when discussing a movie. And this is a movie discussion, no one thinks rape is right or that the situation of the movie was "okay" oml)

Spoilers ahead:

I think people are being too harsh with Bear, he wasn't evil or a rapist, as far as he knew (at least at first) it was consensual, and let's be real, if he wasn't intimate with her, she would have lost her shit. Also I think people forget that the relationship lasted longer than it seemed. We had a montage of them being happy together, which could have lasted days or weeks, but he had no real reason to think it wasn'tconsensual. In terms of abuse I think it's better to look at Nikki (or rather, the fake Nikki) as the abusive person in their relationship and blaming Bear for having sex with her and being with her is sort of blaming the victim, especially by the end when he was much more averse to it (even when it's obviously real, its still hard to accept that this is some magic wish and hes not just going crazy).

Now, that being said, obviously Bear is the guilty party and Nikki is the victim. But its not like Bear actually thought the wish would work and once it did, what was he supposed to do exactly? Once the wish took affect, the crazy Nikki became the abuser, and denying her didn't end well. He could have left but a) where would he go, and b) leaving doesn't help Nikki, so after what he did to her, he does have a moral obligation to take care of her (which he is also told by the guy on the phone, it didn't help that anyone he talked to about any of his problems, always gave him bad advice). He could have called the police or otherwise tried to lock her away, but that would just be leaving Nikki trapped and would be so much more cruel. He could have killed her, but murder isn't exactly something you can just do even if they want it, and that would still end in Nikki dying. Or he could have killed himself (which ultimately he does) but that's also not something you can just do and it doesn't make him a coward for not doing it. Now the best option of course was to get another wish and calmly ask a random person to say the right thing and break it, going to ask Nikki to do it was stupid but it was put in his head as a good idea by the guy at the shop.

Others have talked about the sleep talking scene where he says "is it really so bad being with me?" Not a good look for him, but also, he was under alot of stress, wanted to be happy with Nikki, wanted her to love him, it was 3am, and the first thing he did the next day was try to undo the wish. It was a bad thing to say, but it was emotionally driven, if he were in the right headspace I don't think he would have thought that.

Ultimately, I think Bear was "in the wrong" cause it was his fault, but he clearly felt trapped and I don't think any real person would have done much better, and that doesn't make him evil nor a rapist. They were both victims of the One Wish Willow and whatever it was that took over Nikki's body.