[ And this is a subject which will clearly come up, with her return. He's not inclined to hide anything, but given Seven's unique nature and the fact that Riker - and Troi, of course - have clearly not had the opportunity to get to know her as an individual yet, apprehension may be apparent. At the same time, he would not expect any of the Enterprise crew to dismiss her based on what she is alone.
So he gives a small nod, and proceeds. ]
During her initial stay in the facility, we were - [ just a minor tick of his head ] - pursuing a romantic relationship.