Yeah I also think that Peter looks like an idiot for going along with a changed Olivia. Especially when in that one episode he flat out says, "I've been ignoring the changes about you!" and her answer is basically to screw him so he doesn't ask anymore questions. But on balance I don't want him to be suspicious, I think, because firstly I'm not sure what that would do to him as a character, if he deliberately made her sleep with him like...for what? Or even made himself sleep with her. For what reason? I mean, it's not like he's actively pumping her for information (if you'll excuse the accidental double entendre there). So it would seem almost an exercise in pointless cruelty. And if he's just a little suspicious then again, why not test the theory more?

I kind of like the idea he's well-meaning but oblivious myself, even if I don't quite understand it because he's supposed to be a genius.

I guess I also like it because, perhaps a little pettily, I like when the narrative doesn't elevate Peter and I was waaaaay more nervous about that than usual once they got all romantic with the two of them because that would have been unfortunate timing. So I think I'm mostly just thrilled it doesn't look like they're going down the route of having Peter bravely Solve Everything.