I was doing the same thing and my W is now a lot more comfortable around me and all our interactions are great we speak as if nothing has even happened. She will happily sit at my house for 3 hours and we just talk no awkwardness and no silence. And it feels good she tells me things she doesn't tell her best friends like I am her most trusted person to talk to.
And here is the point, you are trying to get to a place where you are more comfortable around each other but now I have achieved this it's like all over again I question what to do next. There is no real way to tell the difference between them opening up and being comfortable and them thinking they have put you in there friend zone. So every time things start to feel good and I remind myself there is still OM I get lost again.
Maybe as a part of your plan you have other ideas on this but I just end up lost. I really think like Sandi has said you can't nice them back. Just my thoughts at the moment.
ME- 31 W-25 T-5 M-3 D2 ILYBNILWY and moved out - FEB16 W seeing someone else - JUL16