Good job man. It's tough to NOT have expectations, even when you think you don't. I'm 4 months out from BD and still bounce around emotionally almost every day. Stay the course - you are making the right choices for you and your kids, and with any luck, are lighting a path for your W to eventually find her way home.
I think that female friends are fine, as long as you are both sure and feel the same about the status of the relationship. I think it's difficult, but not impossible, for a man and woman to be just friends, especially when both are single. Having another person around is a good idea, to help keep things casual. If you reach a point where you start to have romantic feelings, or believe that she does, then I would quickly back off. I made the mistake recently of actually going on a date, and realized within 5 minutes what a terrible idea it was. I felt guilty the entire time I was with her, and although I enjoyed the company, I simply couldn't relax. To make matters worse, I could tell that she was extremely interested in me. Fortunately, nothing intimate happened, unless you count a hug goodbye as intimate. I texted the very next day telling her that it was a mistake and I am not emotionally ready to date anyone right now. She was actually very cool with it and thanked me for my honesty. We are still texting but doubt I will spend any more one on one time with her.
Good luck with moving forward on the D. Remember, that doesn't mean anything other than a legal status. It has nothing to do with how you and W feel about each other. I've been dragging feet as well but plan on going ahead with my own in next couple of months. There are plenty of stories where people still get back together after a D. Hang in there buddy, you're doing great.
Me 47 W 42 T 24 yrs M 18 yrs W living with OM BD1: 3/7/2015 (A with OM#1) BD2: 4/11/2015 (A with OM#2, W moves out) WW filed for D, papers received 9/18/2015. Meeting to determine child custody 9/29/2015.