I thought the same thing myself. I do agree with Spock's motivation and the way handled it; I think T'pring's response of taking time apart is definitely emotionally motivated. As Spock mentioned that Vulcans feel more intensely than humans, assuredly T'pring (because she does truly love Spock) was quite angry and hurt he didn't disclose that he was human.
The time apart might be necessary for T'pring to realize that Spock's actions were the best course of action given the circumstances.