She could be *thinking* she is just speaking to him as a friend, but we all know they could never go back to just being friends, ever again. This is a common argument (one used in my own house) and I think a pathetic one. Just another excuse to talk to the OP, and again hurt us a lot (that might not be intended, but they should know).
I know what you mean about the things you know actually preventing you from wanting to be around her. I know it says it takes awhile to kick the "OP habit", so I suppose if you want, you can wait and see if the contacts lessen or increase. You are being very strong, good job. I hope things get better.