We dated years ago. She cheated. I gave her a second chance. It was amazing for a few months, then she starts hanging around that guy and his crowd again. I couldn't handle it, so I had to break it off.

Flash forward 3-4 years, during which time we had not spoken to each other. I went my way, she went hers. I had other relationships, so did she. Strangely, I always had this gut feeling that something would bring us back together. I wasn't "in love" with this girl during the gap period, but I still loved and cared for her very much. It took me a while to get over her. In fact, loving this girl is one of the few things in my life that I felt came natural to me. To use a line from Good Will Hunting, when it came to loving her, "I could always just play." Not trying to be corny. Sure enough, 3-4 years after we broke up, I heard she was soon to be moving really far away. I knew I would regret it if I didn't reach out, so I reached out to her to see if she wanted to catch up over dinner. We get dinner, it is amazing, stars are aligning and we both feel it. We are with each other basically 24/7 until she moves. We continue dating long distance, and at that point marriage is a foregone conclusion that we speak openly about. Eventually a great job opens up where she lives, stars continue to align. She encourages me to take it so we can start our future there. I do, and I move. At this point I am thinking I have everything that I have ever wanted. I cannot put into words the depths of how happy I felt in those months. It was obvious that giving this another chance was so worth it.

Within a week of my plane landing she had started reaching out to one of her exes. I didn't find that out until later, but their talks were pretty heavy (professions of love, being long lost lovers, pretty much the same bulsh she told me). She then broke it off with me within a few weeks of my arriving. She couldn't give me a reason for why she lost all feelings for me so quickly and violently. I saw some texts that made it clear the ex played a large role. Sure enough, they are together now.

Moral of the story: People can always change. That doesn't mean they do, just means they can.