Also, I'm with you re: your H saying he was alone in a hotel room with OW and stopped at kissing her. If he has that kind of willpower, he's the only man I've ever known who did. I'd demand a full-panel STD screening just to be safe. If he didn't sleep with her - and if he wants to do whatever it takes to get back into your M - he shouldn't mind. I'd do this before being intimate with him again.
M: 40 H: 44 Married 14 years S11 & D6; D20 & D19 from previous M 2BDs/PAs, 8 years apart Piecing: April 2014