Wow rminer, this reminds me a lot of my W when she started coming back to the MR. I think this is all a good sign. I think you are right to be wary, but I will say just give it time. Keep up DBing. GAL, 180s, remain detached (I prefer "self differentiated"), and being the S only a fool would leave.
If she continues to be consistent over time, you'll know it is real.
Your D21 sounds like a gem! You should be sooooo grateful to have such an intelligent, mature D. If you start a new MR with your W it sounds like a lot of it would be due to your D21. And that is not a bad thing.
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018