I wouldn't contact him. If this woman and you chose to have coffee, together, so be it. It was uncool of her, to post pics of you, on her FB. Did she have your permission, after snapping those photos? Maybe, it's a sincere approach, at a friendship, albeit, the timing is a bit odd.

Perhaps, these intrusive thoughts, are brought about from the fear of discovery? If you were trying to end things, does it really matter, what he thinks and feels?