Daddy dom has a good post about digging for whys, which I've "bumped" for you (it's in the wayward side called something like 'true process for discovering our whys' ).
ETA:
I'm a BS, so I've not had to personally look at this WRT infidelity (but post dday, it becomes an exercise I find helpful in managing my own emotions/behaviors).
I felt disconnected (emotionally and in other ways) from my BH.
Ok, so WHY didn't you find some way to address that feeling of disconnect - other than engaging in an A? Was it bc you are conflict avoidant? If so, what is it about conflict that triggers something inside that creates a self talk that includes things like: it's not such a big deal, or I'll talk to my BS tomorrow, or I can let this go, etc.
I felt we were living 2 separate lives and that I was taken advantage of and for granted.
Why did you allow that to happen for however long? If you felt "taken advantage of" then why not address it w/ your BS (same as above paragraph )? Why was bringing a 3d party into your M the "solution" to feeling taken advantage of? Were you also building resentment toward your BS bc YOU felt taken advantage of? How is it your BS's "fault" (for lack of a better term) for YOU feeling taken advantage of (and I suspect this is one heckuva humdinger for a WS to process, given having an A basically means the BS is not only taken advantage of, but it was done via lies/deceit, so they had no agency to "fix" or address it... unlike the WS who had such a feeling pre-A and had the actual agency to address it, but chose not to).
I have always been a pretty selfless person and felt I was entitled to some selfishness.
FWIW, this is something HikingOut has a lot to say about, and this is absolutely something my WH has had going on for his entire life. So, what is it about being a "pretty selfless person" that helps you? Are you, as Brene Brown would say, someone who has spent a lifetime "hustling for their worth" ? If that resonates, then what about YOUR internal makeup feels you need to do that "hustling" ? Is it REALLY selfless, or is it also a way to seek ego kibble (both internal & external) ?
My WH has a lifetime of people pleasing behavior or "acts of service" -it's like his defining attribute. The man just cannot say "no", even when it creates conflict with others or hardship upon himself. So - what made this part of his MO? I could probably write an entire effing book on this one attribute. Part of it stems from FOO - always being the "boy scout" who did everything right... his mom was a perfectionist and very critical, so he got kibble from her when he was the star at everything (sports, academics, service work, etc). It became the way in which he felt love from an emotionally distant parent. So, the (presumably unconscious) self talk is: be good & do good equals love.
And, he BRILLIANTLY can rationalize the conflict it creates.... IOW, as his wife, I must be an uncaring bitch if I have a problem with his spending 20+ hours/week on community service on top of his bread winning job, when I was "only" raising two kids and he was "saving" our community.
So - WH is gone all the time, BUT bc he's doing his "good deeds" I can't bitch or am uncaring (not only towards him personally, but toward the entire fucking planet) bc I am not equally willing to sacrifice my "need" to have a husband at home for all the "greater good" he's doing for the "less fortunate".... AND he gets ego kibble from the external (ie non nuclear family) world (and for him, TONS of women... yum yum yum!) AND he can feel confident & comfortable in his own internal self talk that he REALLY is a "great guy".... even tho he's living a secret sexual life (and writing this makes me realize that I think MrCleanSlate talks about this phenomenon really well too).
So - when someone says "I felt entitled to some selfishness", it's usually not "just" bc you are basically a "selfless" person.... it's WHY that selflessness is your MO, what you got from it, the ways in which it's not healthy and then working hard to become mindful of it all.
I'm probably not explaining this very well... my hope is that you can recognize that when trying to unpack our baggage, we can't just stop at some logical explanation and think we know "why" we engaged in any particular behavior. And that why isn't necessarily "just" something from FOO... in my WH example, his FOO was more like a "gateway" to the addiction to ego kibble that he perfected in adulthood.
[This message edited by gmc94 at 3:33 PM, September 18th, 2020 (Friday)]