When a close friend is dating someone you don't like, what do you do? The answer is easy: you step in and do whatever it takes to break them up. Next question. Ask Erin: I'm In Love With My Best Friend, But He Has A Girlfriend; For the last two years he has been dating a girl, let's call her Anna, but. By understanding why you don't like your best friend's SO, you can learn to tackle Even if you still don't see why your best friend is dating him or her, you should let “Once the newness normalizes, schedule some girl-time.