Jlove, I've been through this and back! My H had a year long EA with a colleague from another country, he denied having an A because he said "nothing happened", but the emotional component, the texting, FB and calls really hurt. But I was able to get through all that, forgive, love unconditionally (still learning !) but now we are in piecing.
I just saw your post about what happened to your D, and I know the feeling, what my H did also affected our D so badly she got depressed, even cut herself. But it did wake up my H to how it affected not only me but the whole family.
Anything is possible! It is not that easy to dissolve a marriage, or destroy a family. My H was so "done" and initially we even talked about just staying together till D was done with middle school. It did take time, but ultimately my H saw that love is not a feeling but a decision. This was with the help of Retrouvaille.
Read the threads of people here. There are many different scenarios, but what you will find out is that you are not alone. Learn from others mistakes, and apply it to your sitch. Keep posting - and especially if you have a question, want to do something and are not sure. And also, do not make sudden impulsive moves or decisions.
Hang in there!
Me:49 H:45 D:12 M:14 T:18 Bomb: 6/26/10 EA: 9/3/10, fizzled out slowly, now ??? 11/5/11 Retrouvaille Finally piecing.... Its peaceful at last, but we got a looong way to go