Me (M34) and fiancee (F27), I am in the process of calling a halt to our wedding as she has asked for an "open" relationship.

Alright folks where to start, this one is tough to type and the paws are shaking as I'm doing it. As it says in the title, me and my fiancee (ex?) are 34 and 27 respectively, have been together for nearly four years overall and are a year engaged. I'll be totally honest here, just before we got engaged she had an emotional affair with a bloke that she worked with (I only found out because one of her friend's BF contacted me and said that he overheard the friendgroup discussing it). I confronted her at the time, and after a good bit of arguing and hassle, we came to an agreement to let it go. I'll be totally honest in saying that I'm still slightly in the process of getting over that particular incident, and it discoloured my view of her. I manned up, moved on and proposed (which I had planned on doing anyway). This is just to give an overall context here and indeed to let it be known that there has been issues in the past.

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Fast forward to recent time. We are due married in November (travelling abroad for it with family), and back around october she started acting a bit odd. Distant, not herself, away with the fairies. Even stopped having sex, which was very strange. I put it down to stress around organising the wedding, and the fact that we had moved flat. Forward to Christmas time, and now things are coming to a head. I confronted her straight up, and she set out that she was sorry, has just been stressed. I was very considerate, and tried to help her through it.

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However, it basically continued on ebbing and flowing throughout the next two months, up to yesterday. I arrived in from work last night, and she says that she wants to talk. The vibe was bad guys, I could tell. We sat down and she set out that she had been reading, and that she wasn't having second thoughts about the marriage, but the 'nature' of our relationship. At this rate I was getting a bit agitated, and demanded that she come out with what the bloody hell she meant. Basically, a few of her friends had back in October (the times matched up) conveyed to her the idea of an "open relationship"...........basically they stay with their blokes and have one night stands on nights out if they fancy. I'll be honest, the idea made me ill. I said this to her, and she asked to be heard out. Pulled out some online blog post by a blogger who had a husband and live-in boyfriend........I got half way through and told her enough of this nonsense. I wouldn't consider myself old-fashioned, but a wife or fiancee bonking other men will never be in fashion, not in my world anyway. We got into a fight, and in the end she was begging me to give it a chance and that nothing is set in stone. I basically said that I needed some headspace, and that I'd spend the weekend at my mates. It was quick after that, and I left without a fuss. I'm typing this on my mates laptop, and am in a bad mental way atm. I am seriously considering calling the whole thing off, both relationship and wedding. I suppose if anyone has been in a similar place I could do with some advice

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TLDR; Me (34m) and fiancee (27f), she asked for open relationship and I am fuming.