Stress

[xoxoxoBruce]

She's been starting little mock-arguments or criticisms on the most unimportant subjects, and doesn't let off until I get noticably irritated... It's like she's pushing me to see how far I'll go before I snap. It is not typical for her to be insensitive, and I don't know for certain what the cause is.

Maybe when you get stressed you tend to, in her eyes, neglect her. If this happens repeatedly, she probably feels it's the only way to get attention. That said ( here comes the disclaimer) since I really don't know either of you, I may be full of shit. But, I seen it happen before. Good luck, man.