He came to visit 3 times and they didn't fuck? They "slept?" She said that with straight face?

The fact she is even TRYING to sell this to you tells you what she thinks of you.

Then she says she didn't want to hurt you. That risk was obviously worth it to her.

So it has been revealed that her words are worthless and she is completely prepared to betray you. These are facts. Demonstrated, objective facts.

Is this someone who you want in your life knowing what you know now?

Put yourself forward ten years.

She goes on weekend away, a part of your brain starts yelling at you. You have a romantic getaway, you wake up in bed with her, you remember what she did. She's late home from work... She's visiting family... Did she just put her phone down quickly? You will ALWAYS remember. And wonder. Was this the first time? Is it over even now? You will never know for sure. Never. You wouldn't know now had you not been told.

Life is going to happen and these things will be in your life now. Thanks for that.

Her memory of it will be her summer fling, fondly remembered. Your memory of that whole period is now tainted. Every kiss, every coffee in the morning, every plan laid for the wedding, she knew. And then she did it again. And again.

She didn't want to hurt you, I can believe that, but she did. That happened. Stone cold sober, intentionally and repeatedly, smiling and happily planning out her wedding.

How can she respect you if you swallow this crap? More importantly, how can you respect yourself if you swallow it?

At the very least, you need to be away from her. No contact. Weeks. Ask her stay elsewhere. Get your head right. Stop reeling. Get your feet under you. Without constant lies and crying every time you turn around. Gain perspective. YOUR perspective. Not her perspective, because that one doesn't have you at the top of the list.

Then you can decide what you want your life to look like.

As painful as it is, she might actually have done you a favour.