She flushes rather red, considering it was cold outside and there was no reason for her cheeks to be this red. "Oh, no, he's not...Fitz isn't my...we're not," she pulled in a breath, brow furrowed as though this is taking all of her energy. "He's not my husband," she blurts out, a pang in her stomach reminding her of unsettled feelings she'd yet to deal with. "He's my partner. In science! He's my partner in science!"