If you ever decide to
end your affair, I will be here
to forgive you.

------I would take out "ever" and change "will be here to" to "can".

You know this is tearing me
up inside, I cannot make you
stop what you are doing. I can
only pray that you will.

------She may see this as guilting her and may get mad, or she may just think "he has no clue"...either way, it probably won't affect her the way you want it to.

You remain in my prayers. For
our last night together under
this roof as a family come up
to bed and let me hold you one
more time before you leave.

------I don't disagree with this. But, like Karen pointed out, be prepared for her to say no.

Thinking about you, Jeff.