Bo was just protecting her. Everyone could see it, at least, everyone but Lauren. It was sad really, pathetic that the doctor was moping around over the lost love. All Tamsin wanted to do was get her back on track - honestly it was for the benefit of the case not for any other reason (though getting into the human's pants was a side benefit she made very clear that she enjoyed). However, it was only supposed to be casual.
But it got complicated.