Best Friend's Ex With Benefits

I'm in love with my best friend's ex-girlfriend. And, now she's pregnant. It was supposed to be a pretend relationship after their breakup. But fake turned into real and Natalie became my obsession. Her deep green eyes and her innocence is all I ever think about. I'll do whatever it takes to protect her. Especially now that she's carrying a baby. A baby that could be mine. Is Natalie going to tell me the truth about who the father is?