I had 2 very close friends in my friendship group for a good few years. They were close friends with each other too.
Friend 1 had a DP who we were all really close to as well, they were together for 3 years (no children).
Friend 1 has always been a bit selfish in the friendship and a bit absorbed in herself and I'm usually the one doing a lot of the listening but she's got better since splitting with DP and would count her as a very good friend.
Friend 2 was probably the least selfish friend I've had, would drop anything to be with you if something was up, would do anything to cheer you up, and wouldn't even mention any problems going on with her if she knew you needed her.
Then earlier this year, friend 2 and friend 1's DP decided they had feelings for each other and cut friend 1 out and started a relationship together.
I sided with friend 1 and didn't speak to friend 2 or her DP since.
Now I'm wondering whether I was hasty with friend 2 after how much she was there for me for and how strong our friendship was, and should I contact her? Or is that a betrayal to friend 1 and what she did was unforgivable anyway?