My Heart, you abandoned

Bella and Jack were born to be best friends, seeing how both of their parents are high school best friends. Their parents were so best friends that they decided to give birth to Bella and Jack, 3 days apart. They grew together and were there for each other since they were born! Imagine the connection. But as they step into their teenage years... do they really think they know one another or ... are there more than meet the eye?