IMO, I think a simple text with no followup might be appropriate. You have been with this woman a long time, and she has been very special to you in the past.

Perhaps: "Happy Anniversary. Thinking of you"

H 51, W 46
no kids
T 22 years
M 17 years
ILBNILWY 2/10
1st D talk 6/10
partial recovery
W files D 5/11
long distance separation 8/11
moving forward on D 10/11
legal separation complete 1/2012