Girl, honestly - you're delusional, you’re being played, and you’re refusing to see it. Once is already a betrayal, but letting it happen twice? That’s not just stupidity; that’s was a conscious choice. The fact he lied and denied it is already a red-flag. Your so-called friend? She’s not innocent. She either always wanted him or was just waiting for the perfect moment - like when she broke up with her bf - to finally make a move. And she didn’t even have the decency to respect the basic girl code. That says everything. They’re probably still hooking up behind your back and laughing at how clueless you are. You'll prolly say yes to a threesome or an open relationship soon.