If you need to read a book to learn how to compliment your W and if you needed to be prompted by her to compliment her then a sexless M isn't the only problem that got you into this mess. So you didn't compliment her or you were prompted to and you didn't satisfy her sexual needs. I'd bet my retirement that you don't know or you are in denial over the real reasons why she left you for OM.
I know you tell us how you provided for her and how you are better than this husband or that husband but the picture is starting to become very clear. You neglected your W, took her for granted. If you interact with your W the way you do here with us then therein lies a big problem.
M 44 W 43 S 23 S 15 INILWY 9/11 Divorce Mediation started 3/13 June 30 the day W is moving out