My h has shared a lot with me on why he had his EA, and much of it was coming from him not getting what he needed from me. Things that he used to get early on in our M, that had dwindled over time. He just never came to me and shared it with me, and let all of that build inside of him. I wish he HAD come to me with it, rather than have his EA.
And, another thought I had was..... does your W feel like she can really come to you with the deep stuff? Aside from sharing the daily grind, and the stories of friends..... does she really feel like she can confide in you? Is she afraid to talk to you... afraid of judgement?