Hey there anaili,
Oh no! I'm sure you guys have your separate contacts and let's see what we can do to separate those.
When you guys activated your phones, do you activate them with the same Apple ID? Do you guys use the same iTunes account?
The contacts would be on both phones because they are syncing with the same Apple ID.
If this is the case, please create a separate iTunes account for your device and the contacts will no longer mix. For steps on how to create a new Apple ID, visit http://bit.ly/9VNUSz.
Let us know if you need additional assistance.
Please follow us on twitter @VZWSupport