My best friend and ex boyfriend are talking behind my back. What should I do?

Firework344
Back story: i broke up with my boyfriend a month ago due to lack of communication and not feeling loved, wanted and needed. This June of 2017 would have been two years for us.

My best friend told me about this game Summoners War so i played it and i got addicted fast. Told my boyfriend when we were together and we all played together. At some point he got annoyed with her and they fought and she hated him. He couldn't take her complaining so he deleted her as a friend on game. I got caught in the middle and it was a huge mess. I even explained they didn't need to be friends, just keep things mutual.

Fast forward to now and i just found out that apparently the two of them have been talking behind my back. Even after i told my best friend we broke up she still talked to him. She's getting married in July so I know it's not more than friends. But at the same time I don't understand.

I was shocked/surprised when she told me and couldn't fully take in and react cause we were in a group of friends. Now that its settled in i am really angry and upset at both of them and I don't understand why even if all they talk about is the game... I don't understand and I don't know what to do or say. They both did not like each other over the game and now suddenly their friends behind my back? Wtf?
Updates
+1 y
So i talked to her and she got all defensive and didn't apologize. After everything and other stuff she has done in the past she is no longer considered my best friend. I'm done trying.
My best friend and ex boyfriend are talking behind my back. What should I do?
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