<human>: Provide a brief overview of the text.

Needless to say I am completely obliterated. I'm feeling nothing but constant pain right now reliving all the hardships and times we went through. I don't think I've ever felt more pain than reliving everything I experienced with her. 

We had found out she was pregnant around 2 weeks ago. She inevitably freaked out but calmed down. We started planning on what to do. Soon after, she went bonkers and hid herself from me for nearly a week starting last Thursday; I and you guys figured it was normal due to hormones. She didn't call, text, or let me know what she was doing for a week. I was scared half to death, only for her to call Sunday telling me she wasn't sure she wanted to marry me. Cue no contact and nothing to take my mind off anything and more freaking out until today and me worrying like a madman. She finally calls today confessing that isn't mine.

We've always used spermicidal condoms in the 5 years we've been together. She had a moment of selfishness towards one of her friends who liked her and had unprotected sex with him once around a same period we were having sex, so it masked the possibility of cheating at the time. She knows it was a mistake, but now she has to live with it her choice if the baby is brought to term successfully. I'll still want a blood test when the kid is born just to be sure. 

I need advice here. I don't know what to do. She was everything I ever wanted and I wanted nothing more than to marry her and be together. My family was even perfectly okay with us having a kid right now, as I'm almost done with school. I'm completely wrecked. If anyone saw the other thread I posted a few days ago, I had also pushed cheating out of my mind as a possibility, but it was apparently possible for her after all these years.
<bot>: fiancée whom I've been with 5 years had a moment of cheating and is now pregnant with his baby. We broke up tonight. I have never felt more pain than I do right now.