For many women, it is important to have "me time". Time to spend just on them. This can be anything from reading to taking a bath. (Oprah talks about this a lot) It doesn't mean she doesn't like you or doesn't want to be around you...she just needs some time for herself. You should take that time for yourself as well. Do something you enjoy, just for you.

Some couples can be together 24/7...personally, I cannot. I need some space to be my own person and be independent. I love my husband...but I enjoy "missing" him when we are apart. I'm a big believer in absence makes the heart grow fonder though.