<human>: The only two girls I've ever loved are now together and I need your help.

Everyone has a first love Reddit. For me, it was this awesome girl (we'll call her Jane). She was perfect. It was an incredible longterm relationship that only ended after we had to move to different continents. There were other problems too, issues we were going to take away and deal with until we'd grown up enough to get back together and marry each other someday. 

After the breakup we dated other people, the only one who stood out for me was a girl we'll call Grace. We dated for a long time, even though I felt broken up after Jane left (although it's been a couple of years). I got over myself and took the 'love like you've never been hurt' advice to heart. I put absolutely everything into the relationship. All of me.   

Towards the end of the relationship with Grace things started getting rocky. Jane and I had tentatively made friends again and I introduced them, I guess I wanted to diffuse any 'evil ex' situation. I hoped they could be friends. They turned out to be a lot more than friends.
Things rapidly went downhill with Grace, and we broke up a few weeks ago. Today I found out via mutual friends that they're dating. Jane and Grace. And they've been fooling around since before we broke up.

I don't know what to do, Reddit. They've taken all our mutual friends with them. The two people I've cared about have hurt me more than I really thought people could. I guess I'm stupid for caring.. or introducing them.. or not seeing this coming, or something..? 

Sorry, Reddit.

Can you provide a brief overview of the text?
<bot>: please help. Any advice on what to do now would be appreciated more than you could understand. I simply don't know what to do now.