[rosebay11]

It was sad that Corin nomminated Jo - but on second thoughts, who else could she have nommed? Among the newbies, she had shared some tasks with Andrew - and the had gotten on well with him. She had fancied JJ2 and invited him into her bed. She has cultivated long-term relationships with the others.

So IMO, she was "between a rock and a hard place as to who to nominate". Maybe she genuinely justified it to herself that the least "damage" would be done by voting Jo out, as Jo really wanted to go.

I can see where Jo is feeling hurt - but she can't have it both ways. Either she really wants to go or she doesn't.