Here's what we know:
* Long-distance relationship: Zac and Vanessa were both incredibly busy with their acting careers, which often took them to different locations. This long-distance strain was reported as a contributing factor to their separation.
* Young age: The couple was young when they met and started dating, facing the usual challenges of navigating relationships at that age.
* Rumors of infidelity: While never confirmed, rumors of infidelity surfaced during their relationship, which could have played a role in the breakup.
* Mutual decision: Sources close to the couple have indicated that the decision to break up was a mutual one, with both parties wanting to focus on their careers and personal growth.
It's important to remember that these are just the circulating rumors and speculation. The true reasons for their breakup remain private and only known to Zac and Vanessa themselves.