I saw this totally different. I saw her as being totally unreasonable not to at least give him a second chance. How was he to know she would go psycho about weed (although the show never said it was weed, just smoking) without mentioning it beforehand. It probably wouldn't have worked anyway, but she was the one who came off like a total bitch for not even giving him a chance.
Some of these contestants treat this show like their new spouse does not cross off ALL their boxes so they check out without giving the relationship a shot, almost like a house hunting show even though THEY are far from perfect themselves.