For relationships, personal issues, dating, crushes, exes, breakups, infidelity and any aspect of Relationships Ask a Relationship Question /r/relationships/ TL;DR My friend is cheating on his girlfriend, should I tell her? The problem is that this best friend (we will call him. I slept with my girlfriend's best friend and I hid it for years. There, I said it. Now, the old saying 'the truth always comes out' has proven itself to be