[jhoho]

It seemed like you both maintained pretty good boundaries so far, I don't see any indication of emotional affair.

If anything, you seem very cautious to avoid an affair and so is she, which is good. However this is the pitfall in every opposite sex (straight) relationship, never know when can cross into unwanted territory (affair) or maybe wanted, I don't know.

Normally happens when: curious/horny/lonely, unhappy with spouse etc. So, either keep the boundary good if you dont want anything to happen... or the opposite.