My boyfriend's friend is in a relationship so bad that we discuss it constantly. It's fascinatingly bad because the guy is not outright abusive to the point you could easily say, "Your bf is a nightmare, get out," but every time my boyfriend talks to this girl he has a new story, casually related by the friend, that just makes her boyfriend seem consecutively terrible.
This guy:
refuses to do any housework despite the fact that he's home all day
insisted they get a dog, but doesn't help with its care
reacted to a friend's story of almost being raped with "sometimes guys just go zero to sixty"
decided anal is his favorite type of sex, so now they have to have it on the regular even though she isn't that into it
has a gross mangy beard
told her if she ever slept with anyone else he'd kill the guy
but wants to have a threesome (with a woman, obviously)
can't take sexual concrit of any kind
texts her and demands she come home if she's out with friends longer than an hour
calls her with an "emotional crisis" anytime she's away from home and he suspects she's having a good time
never takes his extrovert girlfriend out anywhere to the point that she's lost almost all her friends
was excommunicated by his own friends because just hearing the rude, dismissive way he spoke to her was "too much" and "a new side to him." She, of course, believes the friends are crazy and overreacted.
I would not have had the patience to listen to this shit for months and months, but my boyfriend has been very kind and every few "cute stories" about her boyfriend he will suggest that that behavior isn't ok and that she should stand up for herself. He thinks she might leave the guy soon, after six months of this gentle prodding. I hope she does.