yes, it might be an excuse
Might ?
Did OP have concerns about her lost identity, "strong personality" husband and assumed esteem issues BEFORE she shagged a stranger behind her husband's back ? Did she, say, post on Mumsnet for advice, look into counselling, speak to her friends ?
Or have these issues suddenly occurred to her only during the course of the thread ?
While startling events can and do bring issues to the forefront after previous careful ignoring, I think we need to consider the source before taking certain turns of phrase at face value.
The OP has lied and betrayed her husband. Somebody she claims she loves. She planned to add pre meditated lies and betrayal to the mix despite the risks to the husband and children she says she loves to bits. The only reason why the pre meditated shag is off is because the other guy cancelled. (Hopefully not because his wife smelled a rat and is in full on digging mode to find out where, when and who with).
So we know honesty and truth telling is something she can be quite "fluid" about.
She feels guilty, crushingly so at times I should imagine. Like many who have been where she is before, the desire to lower her guilt levels and reduce the potential nightmare of having to look at your spouse knowing you have wholly betrayed their trust can be quite urgent. The quickest and easiest way to achieve that desire is to shift some of the blame/responsibility onto the spouse. It lowers the guilt load and makes it easier to bear their pain, because you can tell yourself that they brought it on themselves to some extent. (Despite having been deliberately kept in the dark about the thing they allegedly helped make happen.)
Right now,especially after that last post, she is something of a walking, talking cliche when it comes to the cheating genre.
The OP needs to look at herself hard, searchingly, with a degree of honesty and self criticism that is both painful and difficult to face. Rather than her husband's flaws, perhaps she should be concentrating on her own shortcomings? Given they don't appear to be few, or all that mild, given the serious nature of the circumstances.
I have a strong personality. I have (and do) shape what my husband thinks, feels and does. He like many adults in their 40s has identity wibbles due to the changing roles we have been through over the years and the time/energy crunch life as a parent/spouse/worker leaves him with less time for himself than he likes.
Should we give him a free pass to cheat on me ? Because if push came to shove he could write the above on a message board to defend a zipless fuck or two. If you took it at face value and ignored the inherent bias and the motivation to spread the guilt load It would be easy to distort and reduce who I am to just a couple of sentences and completely misrepresent me.
Hand on heart I find the attempt to drag the husband into this and blame share him a betrayal just as grave as the illicit fucking. Salt in the wound he doesn't even know he has. Yet.
I might, might be able to put a spur of the moment fling behind us. But to have misrepresented me, taken a stab at publicly assassinating my character via insinuation to bunch of random internets, for the sake of making himself feel better about himself, at my expense (again)....not sure I could get past that cherry on the cake of deceit.