Just throwing this one out to you for your valued opinions.
I have recently found out (although had my suspicions for a while) that my brother (he's single) has been having a long term affair with a married women who has an 8 year old dd.
Although I feel for my my brother (as he has slight social anxiety issues and has always said he wouldn't know where to find a partner as he doesn't like going to pubs and nightclubs etc. This woman has been a friend of his for many years and they are comfortable together!) I am so very disappointed with him as far as I am concerned she should have been off limits. She is married and even if she has major issues within that marriage it is her responsibility as a parent to either try to resolve her problems or leave the marriage. Embarking on an affair, IMO, will just exacerbate any issues she is having.
Even though I do not know this woman I am finding myself almost despising her for what she is doing to her husband but in particular her dd. As a parent myself, I can not imagine lying to my children and allowing them to falsely believe that their family life is sound and solid when in fact it is as fragile as egg shells!!
Yes, we all have issues and problems and married life is never going to be a long winding bump-free road but surely embarking on an affair whether its short or long-term is the ultimate in selfishness and self-indulgence?