"It's funny. My STBXW has GAL'd to a tee. Why do I have so much trouble doing the same thing? She spends every weekend (I have the kids) spending the night with friends and going out. For some reason, it really makes me jealous how she can get over it that easily. I really need to do this."
It's different for the two of you. In her heart, she was slowly leaving you for over a period of time. The reason it seems like she has no problem living it up is b/c she was more than ready to live the life of a single person. But you have not been able to adjust to thinking of yourself having a life outside of any activity that doesn't include her. Maybe it's part of the mourning the LBS does, IDK.
I feel that a lot of WAW's mourn the loss of their happy MR with their H's. Some of them may not realize that's exactly what they're doing at the time....but they do. After the mouning, then they are ready to let go. So, she has already been through that process, and you haven't. You are still mouning. You don't want to GAL b/c it doesn't feel right. However, from what I've learned, it does help a lot. You just have to make yourself do it.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!