I wondered about that too, but I chalked it up to Susan being so starved for affection, lonely, and scared that she'd accept attention from anyone. Her husband is pretty neglectful and I believe that his "business trips" are very frequent, so she doesn't see him as often as she'd like.
Susan didn't get too upset until she started getting mocked by Peck's other lover, so it might be that Susan either thought it didn't happen or didn't think anyone would find out. I think that she was slightly attracted to him in some weird, unexplained manner, due to the closeup of the interlinking of their hands during the sex scene, so Susan might have been upset at the other woman insinuating that Peck only used her for a booty call. Did he really have feelings for her? Maybe, maybe not. Peck did seem to warm up to her by the end of the film, so I think it's supposed to be inferred that he had begun to see her as more than a piece of butt and a paycheck.
It's just that the storytelling in the film could have been a lot clearer on things like this and we could have used a few more scenes of the two of them together, with Peck gaining Susan's trust. I'd have preferred if there'd been scenes that showed Susan and Peck building a friendship and Peck getting a crush on her, then shown having a vague argument on the phone where he's getting leaned on by an unknown person to do "something", to which Peck gets frustrated and says that he'd do it. (Of course this would be explained later as him talking to her husband.) Even though any feelings they had for each other would ultimately be toxic, it'd compound the tragedy at the end of the film because Susan would have stabbed the only person that actually cared whether she was OK or even if she lived or died.
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