Jet, It sounds as though your W is discovering that life as an "independent woman" aint what it cracked up to be. You must, and I stress must, stop worrying about what she is doing. Stop answering the phone, let her leave a message, and take your good old time responding. Show her that you have more important things to do than serve her needs. She will then start to get curious and things will start to change dramatically.
Here is what happened to my WAW male cousin Brian and his W Robin. They married in high school, both finished, due to her getting pregnant. They went on to have two more children. Robin one day, some 6-7 years ago, came to Brian and wanted a D. She had found someone new. Well she got her D and went to live with the OM. About a year went by and OM dumped Robin. Meanwhile Brian had found an OW who was very nice. Robin wanted Brian back and they remarried about a year later. Today they are happier than they ever have been. Obviously Robin truely loved Brian. He was able to let her go and she did come back. The bottom line is that we must all detach from our Ss. Let them go but still love them unconditionally. This does not mean become a doormat. We must set limits. You must go out and GAL. This includes finding a new female friend. Who knows, you nmay find someone new. Then watch your W come running back. Thats the problem, you start a new R with someone else and they think we will take them back just like that. Its tough, I know, but you must GAL.