My w texts and phones her "best girlfriend" from 6am all day until she goes to sleep around 11pm. It's so much that I'm beginning to think that they are having an affair. Is this normal behavior for woman friends?
Yes. It's something of an EA. My W did the same with her newly separated BFF for months, texting morning to night. Her BFF was her enabler, adding fuel to her "I want to be free!" fire. Then W moved out and they hardly speak or text anymore. I'm doing a bit of mind-reading here, but I think they went out a few times after W moved and W may have realized that's not the life she wants after all. She seems to have forgotten that she didn't even like clubbing when she was in her 20's. W has since returned to kid and family activities, but so far she's not reaching out to me beyond being friendly. I'm still giving her space and time.