Yes Skye and that is where the erase button would be very handy. You can deal with the present but its the memories of what 'appeared' to be a reasonable relationship with the father of your children is what I find hard to take.
That, and in my case, like the author of the article, having to deal with the flourishing relationship that the exH and OW now have. It seems they have all the great holidays, family time and together time any couple could want. Where the person who is left has to deal with the grief, emptiness and loss in all areas of their life. I dont know what I have done to 'deserve' this in my life but it really is an absolutely dreadful place to be and I wouldnt wish it on anyone.