Anthony agrees to start dating Poppy Meadow (Rachel Bright) in next week's episodes, but later locks lips with her best friend Jodie - who he secretly has stronger feelings for.
As reported at the weekend, the pair's moment of passion comes as they search for a missing cat on the Square.
Lapinskas told Soaplife of the storyline: "Poppy falls for Anthony and he's just pleased that somebody likes him. He gets the feeling that Jodie likes him too, but Poppy puts him on the spot and says, 'Jodie says you have something to ask me' and he says what he thinks is expected and asks her out."
However, discussing Anthony's secret kiss with Jodie, he continued: "[Anthony and Jodie] get on really well and Anthony thinks he's in there and goes for it. She kisses him back, but then she pushes him off angrily. Poppy's her mate and she knows she likes Anthony, so she walks off."
Lapinskas explained that Anthony later goes back to Poppy following the rejection, while Jodie struggles to come to terms with what she has done.
"[Anthony and Poppy] go out again, but Anthony really wants to be with Jodie," he said. "But Jodie tells Anthony she feels awful about kissing him behind Poppy's back, and says she wants to leave London."
EastEnders bosses recently confirmed that Jodie and Poppy will both bow out from Walford in an episode which airs next month.
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Watch Jodie Gold's EastEnders character trail below: