Zylka - an actor who has appeared in 90210 and The Secret Circle - tweeted that Hale recently chose to break off their six-month romance.
"Don't have a girlfriend - she decided she was too good," the actor tweeted when a Twitter user complimented his "girlfriend" Hale.
Zylka later defended the comments when some Twitter followers accused him of unfairly attacking his ex-girlfriend.
He wrote: "Never any disrespect towards anyone. Only if you say what you say you should stick to it. If you say you love then love."
Hale recently publicly denied that she is dating her long-time friend, Teen Wolf star Colton Haynes.
"He's just a friend... Although I would be very lucky to have him on my arm! We're just friends," the star said.
Hale currently stars in Pretty Little Liars, which returns to ABC Family on October 23.
> Pretty Little Liars Lucy Hale: 'I used to go days without eating'