Never have threesome with your friend

One month ago, I had a cute boyfriend Bob and my best friend Lily. Now I lost them both due to threesome hookup. I am telling you that you should rather have threesome with strangers on tinder for threesome dating apps than with your friends. We invited Lily to have threesome hookups with us for several times for nearly a month. After that, there was one time I went to my boyfriend's and try to surprise him. I caught them watching TV in the couch. Lily is wearing his clothes. I left right away with the door open. Bob didn't come and catch me.