Advice-Your views/oppinions

Hi, Basically me & my fiancé have been together 5 years engaged for 2. Just over a week ago she left me, she ran out of work midday & took most of her stuff from our house & went to her parents. She text me just before she left saying 'This is hard, but I think I have to move, I cant be with you any more, I don't see a future,its all my fault'. Now alarm bells rang straight away as I & everybody else who knew us thought we were happy & an ideal couple she is my soul mate. I also defiantly knew this, we'd been saving for a mortgage, been on holidays etc etc. So I rang her immediately and she still tried making up excuses that didn't make sense. I finally got it out of her 'She did something stupid the Saturday night before' basically she kissed another man on a night out, now I knew straight away she would of been under the influence & she sounded genuine. She didn't seem to want to sit down & sort it out. She rang my mum who she also works with and said she had been stupid & that she thought I could never trust her again-Not true! Now I carried on communicating with her & she said she didn't know who it was or why she done it. Now after a few days she started saying she needed alot of time and that she would be back 100% she just needed to sort her head out. I believed this especially after she came to talk to me face to face the following Friday & again she seemed genuine & that time was needed. She said she'd keep her head down & not talk to any other men & focus on us. I believed this, UNTIL the Saturday after she talked to me face to face she said she was working in the evening (She works in a special needs children school) but also is a passenger assistant. I knew that when she text me saying she was working at 11pm on a Saturday night something wasn't right! So I was naughty & hacked her Facebook account as I needed answers instead of being left hanging. I basically found out the guy she kissed was a teacher at the school, and after she left me she was flirting with him it was in her messages, it did confirm it was still only a kiss but they both apparently didn't regret it, there was also a bit of bit**ing about me that were all made up lies, like I cheated & that I didn't want her back etc etc. I confronted her about this and again she broke down and said she didn't know why she said this stuff, but they don't talk now & are being professional. Know I still see it as a drunken kiss with a bit of stupid flirtatiousness attached, so I said I would take her back as we agreed throwing 5 years away for a kiss is stupid. Now though she is still serious about it taking months as she put it to come back to me (she stated anything from 2-4 months, she's even taken a 4 grand loan to buy another car & insurance) this is what I need advice on, nobody can understand why/how she needs all that time & also how she knows she needs that time? I've always fought for this girl , to me she's always been worth it, she's never done this before, never done anything before in fact. She constantly says she will be back in time, & we will be mates & meet up regularly until she feels ready to come back? I said I wouldn't take her back if she messes about with any men at all on this time allocated to 'sort her head out' she said she wouldn't as she wants us. That's pretty much it I'm just really confused about the time she thinks/knows she needs. Any help advice would be amazing! Thanks again

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