There is a girl that I thought was 'the one,' but now I no longer want to date her.
What happened to make you no longer want to date her?
Me and the girl have recently entered into a steady relationship. My friends are against it because she has breast implants.
You're being very naive and shallow for leaving a girl for having breast implants. If you think she is perfect for you, you shouldn't care what your friends think. You should pursue her instead.
Women with breast implants aren't my type.
You thought this woman was perfect for you and her having implants changes nothing about her personality and who she is. Don't listen to your friends and think long and hard as ending the relationship over something so silly might be something you truly regret in the future.