Divorced from Johanna Larsen
History: Zack and Johanna were hot and heavy when he was practicing medicine back in Seattle and she was working at a popular news magazine. However, commitment phobic Zack ended things right before he left for Coral Valley leaving Johanna heartbroken. When Johanna came to town, she was surprised to discover that Zack had moved on with Blake, but little did Zack know Johanna had a surprise of her own. She was pregnant with their son and while Zack vowed that he would be there for the baby, his relationship with Blake continued a bit longer. Ultimately Zack decided to do right by Johanna and the baby and he married her in the hopes of keeping her in his life. Eventually the two remembered their love for one another until Zack's latest surprise return in Coral Valley.
Dated Blake Ashford
History: In college Blake Ashford was bound and determined to break out of her Ashford ties and that started with attempting to seduce her best friend Caitlin's brother Zack. The two became fast friends, yet despite all Blake's attempts to seduce him, he'd resisted. Of course when he came to Coral Valley that became a different story when Blake and Seth were broken up. Zack and Blake still felt the chemistry and came together again only to have their relationship fall apart when she discovered that Johanna was pregnant with his baby. However, Blake was able to recover from the loss when she reunited with ex-love Seth Alexander.
Involved with Michelle Sprite
History: Although the details are sketchy on exactly what's going on with Michelle and Zack, it's clear that these two are leaning on one another for more than just plotting partners. Will roance follow? Time will tell.