|||UPDATE||||

I wrote her a letter basically explaining that i knew what was going on. Also explained how great my dad is as a father and as a husband; how i felt about her bringing that man into our home; how i felt about her doing this to dad and family; and how i lost all trust in her and i never wanted to see that man near us.

After she saw the letter, she went to my job and i went out to hear what she had to say.
She looked like she had been crying and i felt so bad for her, i did not want to see her hurting.
and she started explaining that it didnt mean anything, that it was only messages, nothing physical had happened. How my dad is the love of her life and how she could not live without him and vice versa. that my brother and i were her everything etc..
I just wanted to tell her if that was how she felt, then why did she even think of doing it, that maybe she wasnt happy. and i asked her if my dad knew about it, and she said no. That she didn't want anyone knowing, nor the whole family because then everything would be so messy and that she didnt want to hurt my dad.
And this whole time, i was just crying.
i could not get the words out of my mouth. all the things i wanted to ask her, and tell her, i could not get out.

Later today, she called me and said it was done, that she was never going to do that again and she loved us etc.
And i want to believe her so bad because i just want this whole thing to be over, but that would mean lying to my dad.
How can i live when every time i look at my dad i feel guilty.

So if anyone can help me to get the right words out, instead of just crying like a baby i would really appreciate it.