I've posted this story on several forums now, I guess because I am still in shock and grieving my relationship and am feeling so lost. I (26M) had been in a relationship with my fiancée (26F) for 2 and a half years and we were due to be married in July. 

I thought we had both been in love and that we were looking forward to the future. Our conversations had always been so effortless and easy, we did everything together, she called me her best friend and was just an overall amazing and supportive girlfriend. On May 29th she sat me down and told me she had something to tell me. She proceeded to tell me that we needed to break up and that marrying me would be the worst mistake of her life. 

Obviously this shocked me, especially with no context behind it and so I kept asking her for the reason why which she was adamant about not telling me until after several hours of arguing she finally admitted to me that she's a lesbian. I didn't believe her and at this point I was thinking she was just cheating and trying to leave me for someone else without that being uncovered.

I demanded to look through her phone and she was hesitant but agreed. I did not find any evidence of cheating, but what I found will probably haunt me for a long while. Search history full of lesbian porn and erotica from at least the start of May, locked folder full of saved pictures and videos of women dating back from before we even started dating. A text conversation with an older co-worker from September where she's telling my fiancée that when she comes out she can stay at her house if reactions are bad. Her ChatGPT account even had several convos of her rehearsing how to tell me/her family over the course of the last 3 months.

Despite this at the time I still wanted to be with her and I asked her if there was any possible way she could be bisexual (she always told me she was straight). She told me if she was bisexual she wouldn't leave me and she said it's basically over and she doesn't want to try and that she has no attraction to men and never has. That her attraction for women is overwhelming and she cannot suppress it any longer.

I felt like the air had been punched out of my lungs and since then we are now sleeping in separate rooms. I have told my parents the wedding is off but not why because it makes me feel like less of a man and they keep asking. She has only told her best friend the real reason why as well, though her parents also know the wedding is off. 

The worst part is that it seems like she barely wants to interact with me and every time we talk it's about this one thing instead of like old times when we could laugh over shows or movies or other things. Every conversation is like another stab in the heart and another reminder that I can't be what she wants.

I'm also dealing with a lot of self-resentment because I feel there were signs I ignored. Early on into our relationship when I initiated sex, she panicked very badly and started crying and breaking down and telling me she was gay. But the next day she took it back and blamed it on stress and that she only said that because she really wasn't in the mood and felt guilty. Also our sex life was really bad and infrequent, I had to basically beg her to have sex. She never wanted penetration and would give me very half-assed oral. Never really got aroused or wet, which she blamed on a medical condition. Even at our most frequent times it was never more than once a week. But I thought it was normal for some women to have low libido.

She also confessed to me a long time ago that she had dated another girl in high school, but she made it seem like the girl was crazy and obsessed with her and that she only did it to make her stop. I bought it, though at a later time I discovered she still had this girl added on social media and that they had actually talked shortly before we got together but I didn't piece anything together. She would also always talk about how lesbian sex is disgusting and gross and that most of the people identifying as LGBT are doing it as a trend, she seemed almost proud of herself to identify as straight. 

It's been a very confusing time for me and I'm not sure what's next for me. She's made it clear that our relationship is over and has shut down any attempt at reconciliation which has hurt me immensely. Sadly, we are probably going to still live together until our lease is up which is thankfully only a few months away. We also need to work out our wedding expenses since now that isn't happening anymore. I feel like my life was so full of promise and now it's just ended in the snap of a hat.