Speaking to Zap2It, Boneta explained that his character Alex will begin a relationship with Spencer (Troian Avery Bellisario).
However, he suggested that the couple's romance will not be easy.
"He meets Spencer at the country club and at first it's kind of like a forbidden love kind of thing," he said. "They're not at the same level and socially there's some pressure with Spencer and her dad, but Spencer follows her heart and things start getting a bit more intense with Alex."
Boneta also revealed that the duo will have a romantic scene in the country club kitchen.
"The scene is an awesome scene," he said. "I'm chopping some vegetables and sauteing and cooking and Spencer's there kind of helping me out and my song is playing in the background, 'Siempre Tu', and Alex grabs Spencer and they start dancing, salsa dancing, to the music. So it's a very sexy scene and I hope you guys like it."
Pretty Little Liars continues on Tuesdays at 8/7c on ABC Family.