Can someone give me advice?

Recently I told my bff ex that he was hooking up with a girl not long time ago, just like friends with benefits. I told her bc I thought that they broke up so she has no feelings anymore, but it seems that my bff lied to me by saying they dont communicate anymore. I heard from her that they had an agreement that maybe they will be back together and etc. I hurted my bff by betraying him and I hurted his ex feelings bc I didn't know that they had that agreement. I dont have that strong friendship with him anymore so I dont really feel that bad, bc I already was hurted by him many times. But I atill dont feel good. I apologized to both of them. What should I do?