You are really starting to annoy me now. You come onto a forum that is well known for helping women who have been cheated on, you have been told to read some of the stories here from said women, you have been told some on this thread. The opinion here is almost unanimous, which hardly ever happens on MN ...
Yet you still fucking insist that your dp is different, your dp wasn't happy, your dp didn't mean to hurt her, you didn't meant to hurt her, you are happy, your dp has no reason to leave you, over and over and over and over a-fucking-gain!!!
It's insulting & shows a lack of respect to those who have shared with you here, it is insulting to his wife & it is insulting to your friend.
Your dp is NOT different. Yes, he has told he wasn't happy, but has he told you
how he begged her to forgive him?
how he swore it was "only sex" and "meant nothing" with you?
how you pursued him and "made" it happen?
how you made all the moves?
how he promised to dump you, delete your numbers & never see you again?
how he swore he loved her & only her?
how he cried & pleaded for her to allow him to stay?
No, of course he hasn't (but you can bet your last $ that he did exactly that, because they all do), because he knew that if he did, you would run a mile. You have never been his first choice op, except for now, by default, because the man cannot do without sex.
This isn't about his wife changing, this is about him wanting to have sex with as many women who would allow him to, while believing his lies.
He isn't different to your friend's dp. You need to believe he is, because without that belief you will see that you are a mere stop gap.
You say you want help to overcome your guilt, but you don't...you want us to tall you that your d is better than your friend's, you want us to say that you are better than the woman your friend's dp slept with, but you aren't.
Your posts aren't about your friend, or your guilt (although you do throw that around a lot) or how to hep your friend, your posts are about you, and how fucking perfect you think your life is.
As I said, highly insulting & disrespectful! I think you should go away now. You will not get what you want here, and rightly so.