I just have to be on my toes to not get sucked in, cuz I know he'll try....
Oh, you can COUNT on it.
Try to think now, ahead of time, how you want to respond, so that you'll do so effectively. Us Hs, are, after all, pretty damned simple, predictable creatures, if you just stopped and thought about it.
Puppy
OK Puppy so I've been thinking more about this... I know H will try to push my guilt buttons. He will try to make me feel sorry for him in some way and that I am somehow responsible (at least in part) for whatever it is he is feeling...
If he brings this up in a SERIOUS way, I would say something like "I'm really sorry you feel that way. I would like to focus on our current issues, though, and work on our marriage, and we can't do that as long as one of us has unilaterally invited a third person into the marriage."
If he brings it up in a pouty, "woe-is-me" way, I would say something like "You know, that feeling-sorry-for-yourself, martyr routine REALLY makes you unattractive. Can we please focus on the issues at hand?"