What Is the Name of This Book? question

It's about 2 best friends in love with a guy called Sawyer I think? The prettier, perky best friend ends up with him and they start dating. This girl ends up crashing her mini Cooper and doesn't make it. That night the other best friend was with this guy getting ice cream and they ended up kissing when they got the call about the accident. Months passed and these two started dating, she got pregnant and was on his way to tell but she saw him packing up his car and leaving. 2-3 years later he returns and finds out that he has a kid. However, she was with another guy who was the twin of her new best friend. Basically, at the end, she and Sawyer end up leaving together with their babygirl.