T, is your W wanting to ML while also still pushing forward with D? If so then I guess she just sees it as a purely physical connection? I'm not sure how long you continued to ML after BD, but for W and me it was a few months, pretty much right up until she moved out. It was REEEEEEEALLY awkward. There's a big difference in ML with someone that really cares about you versus ML with someone that's just looking for a physical release. If you think it's going to make you feel used, then don't do it.
