That's just it, though - H really ISN'T flirtatious generally. He IS friendly and outgoing, and some women might mistake that initially for flirtation. But when other women flirt with him....well, I guess it depends on the state of his depression. When he's in a good place, he displays my photo and very quickly manages to bring the words "my wife" into the conversation. When he's in a dark place, I guess it's just so tempting to enjoy a little bit of being admired by another woman, too easy to rationalize it as just a "friendly" interaction.
OW was just an acquaintance at work who roped him in by saying she was learning to surf and needed help picking out a wetsuit. H thought he'd be the "good guy" and help her get a deal at the local shop where he knows the owner....then her brother "conveniently" broke their dinner plans for that night, and she was all on her own, and H "nicely" offered to take her out to dinner with him and the kids - to HER favorite place, KFC - YUCK. Well, we all know where that story went from there.
This is why it's so important for H to know his boundaries - precisely because he IS so naive. Even he will admit he didn't see the ways in which OW manipulated him and the sitch until long afterwards.
I'm happy he seems better now, and willing to give him a cautious pass on this one. But it really did make me aware that I am dangerously near the end of my rope.