These situations are a nightmare, hopefully nicole will hold her head high because this is not her fault.
Yep, situations like this are a nightmare.
Discussion of fault is why there is an ongoing battle in this thread.
The cousin is entirely responsible
for his behaviour, which is boorish and unacceptable. He needs to be turfed out.
Hawkeye's gist is accurate - our OP has contributed
to the situation by not standing up for herself / setting boundaries. Had she done so, this likely wouldn't be an issue for her to post (hard to tell, but properly standing up for yourself usually sorts these issues out). None of this means she is to blame
(she is not - he is responsible
for his actions), but that her lack of action has contributed
to the end result. You'll find that on any psychology site dealing with such issues (and Hawkeye posted one such)- and really, to attack Hawkeye for saying something that is quite accurate, is petty.