Yes! How can he not realize Terri's faking it by now?
Well, wasn't it a couple of episodes back that he was shocked that she wanted to have sex so much more often than she had been? And yet conversely, she's been all touch me not about him not getting near her now that she's "pregnant."
I think what we're supposed to be buying into here is that they've had this very distant relationship for a long time and that overall, Will's been "settling" in all aspects of his life, for a really long time. Which is sad, when you consider what a relatively young man he is, but is so incredibly relevant in that I see a lot of people just settling. Resurrecting Glee isn't just about reclaiming the glory days of his youth, it's about reaching out and grabbing a dream that at some point, someone told him was out of reach and that the best he could do was settle. That's really the overarching theme of the whole show. Will's realizing that he's done too much settling and he's taking steps to resolve that. Finn realized as a little boy that he didn't want to settle. Quinn clearly doesn't want to settle.
ETA to add, it's interesting seeing how Will's return to Glee and performing has also prompted his dad to reevaluate what he's done with his life and reaching out for a long-held dream of becoming an attorney. It's all very much a snowball effect.
The characters who are willing to settle come across as the least sympathetic of the lot. And what makes Sue stand out is that she doesn't want to settle, she just wants to command her own little slice of the kingdom-- everyone else has to settle for what SHE wants.
For me, the most heartbreaking moment of the entire series so far and I think a real turning point for Will, was when he looked at Terri and said, "Every time I've had a fire in my life you come along and burn down the forest."
I'm probably overthinking this, but it seems as if there's so much good storytelling stuff going on beyond the surface fun stuff.