I haven't been completely dark...actually Dim like you say.
Other than a checking in with her to see how she's doing, I've engaged her from time-to-time for casual things like shopping for curtains for the house, going to a movie, watching/going to our college's football games, having dinner, going on motorcycle rides, etc.
Some things she participates in, but most of the time she declines. We are on very friendly terms, but will usually say that doing a certain activity is too "hard" for her.
I try to space-out any invitations for these types of activities so I don't come off as to pursuing, and in between have relatively little communication with her. Although it's difficult, I've kept any relationship talk out of our interactions for quite some time.
M: 29, W: 28 Together 8 years, Married 1 (5/16/09) Bomb (LYBNILWY)4/22/10 Affair discovered 5/3/10, began Jan/Feb 2010 Separated 5/22/10 - Present Affair exposed 7/7/10 No children