Could be hormones, could be regret, could be MLC and she is just lashing out at you. I did all those same things! Then I did think about the ramifications of divorce and realized I was actually anti divorce. She may not really want a divorce. She may just not see how else to change things in her life. That is why 180's as Neph mentioned are so crucial at this point.
I had an uncle win his wife back by becoming a dancer. yes, a real kansas city beef eater dancing to the latin beat. It totally worked!
I am not sure about the pursuing thing. If you always gave her space then doing it now is not really a 180. But it is you that wants more quality time. Maybe the best thing is to act liuke a beginner. Go back to the beginning when you first dated.
Me:38 H:39 MLC M:10 R:23 years D6 S3 Bomb: Easter, 2007 "Every day may not be good, but there's something good in every day."