This sentence is kind of interesting. So, you were 'just making small talk', until they told you they had a boy/girlfriend, and then, you just ... stopped 'making smalltalk'? :-P
Because since he now knows she has boyfriend, therefore he is not hitting, therefore logically she is unlikely to interpret further conversation as hitting. Incidentally, that is remarkably similar to the way people on spectrum "logically" interpret humans - have hard time imagine other person perspective (here he knows he is not hitting therefore she knows too) - and get into trouble despite really not having bad intentions.