Quote:
Problem is, I don't want to inform her about my finding of her chatlogs. How can I break-up with her so it hurts her the most.
- Consistence
What can you say that hurts her the most...Do you really want to become that kind of person?, yes she has hurt you and what she did was wrong.
You can't change what she has done but you only have control of how you react and if you choose to act like a dick well...it could come back and bite you in the ass.
EVERY PUA should try and leave the girl better off than they found her, if you want to break up with her you should do it in a civalised way.
In other words show the person youve have had a realationship with the same decency you would show to a stranger youve met on the street.