She Left Me for Her Best Friend's Sister

So I guess it’s over between us. She told me yesterday and I couldn’t believe my ears. We’ve been together since college, three years now, but things changed when she introduced me to her best friend, Jane, a few months ago. We hung out a lot. Jane is so much fun, always laughing and telling jokes. One night, we were all at her place watching movies and drinking wine. I had one too many glasses and started feeling light-headed. Next thing I know, Jane’s leaning in close to me, whispering that she has feelings for my girlfriend. I was floored. The idea of them together wasn’t something I ever thought would happen. It made my heart race thinking about it though. Maybe because I knew deep down there was a connection between them. So we decided to let each other explore and experiment, under the guise of just being friends with benefits. We’d meet up in secret and try different things together. One night, we even tried role-playing. She wore these sexy lingerie pieces and acted all naughty. It was hot but also made me realize something. I started having feelings for Jane too. She’s so confident and adventurous. When I told my girlfriend about this though, she got angry. Told me to choose between us. Of course I picked her, or at least tried to make it work with just the two of us again. But eventually she confessed that she was seeing Jane behind my back too. She wanted a threesome but said she’d wait for when I was ready too. Then out of nowhere, Jane shows up one day and says we should all go on vacation together as friends. That weekend, we did try the three-way thing in private. It was wild and intense with both of them wanting me at once. But it ended up being a turning point. My girlfriend wanted to be open about everything from now on but I wasn’t sure if I could handle that much openness. In the end, she decided we were better off apart. Jane will keep seeing her though. And honestly, there’s a part of me that hopes they find what they’re looking for together.