Pissed is an understatement

I'm so pissed, what I thought was my best friend totally lost all respect from me tonight. She's been sleeping with a guy who has a gf whom is expecting a baby in July. I've told her my thoughts about it and of course she didn't like what I had to say. Well she was going in for a surgery Thursday and found out she was 5 weeks pregnant by this guy. She instantly said she was getting an abortion, I talked to her and tried to get her to let my sister adopt this baby. She'd be a great mother and this baby would be well taken care of. She had two stillbirths and one miscarriage And hasn't conceived since. Well tonight this "best friend" is out getting drunk!!!! I'm so damn disgusted. I don't even know what to say to her!