<human>: My fiance and I had taken a break a few years back and I guess she had met another woman and they had started a cyber relationship. When my fiance and I got back together she was continuing to have cybersex with this girl very often. There were feelings involved and she said that she loved this girl, but wanted to be with me. I found all this out 2 weeks after proposing to her. I told her if she wanted this girl I would respect that and back out of the relationship but she told me she 100% wants to marry me and start a family with me. So I told her that I never want them to meet (girl lives 20min away) and that they can talk as friends but that's it.

This was back in December. Our wedding is in a few weeks and she is pregnant with our first child. I just learned that she has been continuing with this affair since December. They cybersex each other very often and talk about how much they want each other, but apparently haven't met yet. My fiance is very much in love with this girl. 

Some of you might say my fiance wants me for my money which is untrue. She's the breadwinner in our relationship and is very assertive and independent. But she is pregnant with my child and says she loves me and wants to spend the rest of my life with me. I love her family and they love me as well, but as a man I need to have some pride about this. 

What advice would you give me? Should I ultimatum her? Tell her to either never speak to this girl again or I'll end the engagement? This girl is the love of my life and I know she's the one, but I'm torn as to what to do.

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Can you give me the gist of the text in a nutshell?
<bot>: Getting married in a few weeks. Fiance is having an online affair with another woman and has been doing this behind my back for years. Torn as to what to do.]