[Rorkimaru]

In the episode (iirc) the only interaction between Mark and Harry was when she refused to take part in the task risking failing it. I'd have been frustrated too though I like to think I'd have handled it differently.

Also it's difficult for the housemates to support her when she blanks them all. I get that she doesn't like to share her emotions and that's ok but it's hard to comfort someone who doesn't want to be comforted. Nick tried pretty damn hard and the closest she could get to asking him to stay was saying she didn't care if he did or not. The poor girl is suffering but there is a lot of support she's just not interested in.

Mark doesn't like her but he's keeping his distance and trying to carry on unless forced to interact by big brother. And if one doesn't talk and the other does you can't blame the housemates for spending time with the one that interacts with them.