I think her infidelity bothers me so much more than Urquhart's because he never acted like he was loyal (to the audience, anyway).

You're right. Poor Andrew. I hate the fact that after a while she doesn't even try to cover it up! It's pretty tacky really.

I think Urquhart's infidelity isn't even infidelity in his mind, or Elizabeth's for that matter. In a marriage as open as that there is a different sort of loyalty. She's clearly the perfect match for him and he comes to depend on her more and more as the series progresses. It's weird but that's why I love it :)

and I'm glad, because I fear his reaction if he did figure it out

Umm...yes, now you come to mention it I think that might be horrible. Eeep!

It seemed like the thing with the tape was the first time he'd really waited that long for a plan to mature

Yeah, and even then he doesn't really plan anything, lol. Like in the warehouse scene with Sarah, she's like "what are you going to do?" and he has no idea, as if he hadn't really thought any further than upsetting her XD

Poor boy just wasn't cunning enough when it came down to it.