I say if you have a friendship that you can keep as a friendship, then no harm no foul. So what if it is with a member of the opposite sex. Set your own boundaries and stick with them. And be sure the other person knows your boundaries as well. You need friends.
I am not sure I understand your C. He is telling you to keep fighting for your M but telling your W that it she should move on?
I would not read into the text from your W in any way. It has too many ambiguities to know for sure. So for that reason alone, I would just take it as a positive she contacted you and leave it at that.
Me: 42 W: 32 Married 7 years together 8.5 S1: 7 S2:7 Bomb #1: 09-16-13 Recon #1: 11/13 A discovered 04-03-2014 W filed D 05-19-14 but never served me I filed D 12-02-2014 S 05-31-14 Divorced 5-19-16