Well, if it helps, he always seemed to be about as standoffish as one would expect him to be in the relationship. Hans definitely seemed to feel that it was little more than an attempt at diversion, and the whole affair seemed to be pretty sedate.
I would wonder if anything might have come of the relationship after the war was over and Hans realized the "killer sky" wasn't going to claim him, though. Supposedly he has a descendant in modern continuity, so...