I betrayed my closest friend's trust, how do I fix this?

So, me and my friend ( call her Jenny) are really really close ! And one day Jenny and my best guy friend ( Johnny) liked each other while Johnny is dating a girl called Vivian which those three are all my friend! When Jenny told me that Johnny and her secretly liking each other behind Vivian's back I felt bad then I told Vivian. then Vivian do stuff and start posting up pictures of them talking chessy.. after that I turned fake and asked Jenny like " oh are you okay?!" Etc then she found out :( and now I feel bad, what do I do ?