So, I (30M) was just dating a (28F) for the past 3 months. We saw each other for about a month before beginning a committed relationship. I felt like everything was going perfectly, and then she broke up with me out of absolutely nowhere 3 days ago.

In a previous relationship several years ago (former partner is deceased,) they were swingers. We talked about her past and I said this wasn't something I was interested in, and she said she was perfectly okay with that.

She broke it off with me because she decided "monogamy and being tied down to one person just isn't for me." She gave me a bunch of other random, weird BS excuses but it was absolutely devastating.

She informed me yesterday that she "wasn't really feeling it" the ENTIRE TIME we were together. She definitely gave off a very different vibe. We spent a lot of time together, talked constantly, had sex regularly and frequently, met each other's friends/families, etc.

I'm just so confused and there are so many things she said that are contradicting. I was about to start talking about us moving in together soon... She told me she felt like she was "just settling," meanwhile I felt like we had a perfect relationship and were "two peas in a pod" as they say. I feel like she hyperfixated on some of our differences the entire relationship, and didn't actually stop and think about how much we had in common. (According to her we had "nothing" in common, and were complete opposites)

I'm just feeling really down right now and I've got other issues pertaining to my job also stressing me out. I just feel so lost, betrayed, lied to, led on, and feel like she entirely wasted 4 months of my life and that everything was a lie and the person I "thought" I knew doesn't even exist.