I can tell you the entire problem in one word, JEALOUSY! She saw you bring a younger, sexier, curvier, "faster" thing around, and saw you paing more attention to her. So she said...
'Hell no, you're not going to just jump in me all willy nilly after you havent touched me in God knows how long, after you've had your hands on her and not expect me to throw a fit. 12 years I've been loyal to you, and this is how you do me. I'm going to give you all the warning signs to make sure this never happens again. Don't get complacent with the attention and affection I need....or I'll take you for all your worth'
It's all the same one way or another.
