I have been following your thread for some time; please permit me to comment. My situation is similar (except WAW has been sleeping with her out-of-town lover for 9 months). Also, she has told me she is going on a business trip tomorrow; she knows that I know she will be sharing a hotel room with him. Also, she is spending lots of $$ on this affair, mostly hotel rooms and extra cell minutes, costing us around $200/month She has also lost a lot of weight. She hasn't weighed this little in at least 10 years. So I feel for ya' brother.
You are doing the right thing. Give her space, don't pressure, and don't be excessively accommodating or nice. Continue with GAL (I too am fixing up my fishing boat which hasn't been wet in 10 yrs). And buying new clothes is a PERFECT 180. Spot on.... not girly at all!!