Anthony bows out from Walford in a fortnight's time as his romance storyline with Albert Square newcomer Alice Branning (Jasmyn Banks) comes to a head.
The antiques dealer realises how much he likes Alice in upcoming episodes, but he is still unsure of how to deal with her troublesome family members Derek and Joey (Jamie Foreman and David Witts).
Lapinskas told Soaplife: "Joey manipulates Anthony into challenging Derek, which is a big mistake.
"I can't give too much away, but I can tell you that after going up against Derek, Anthony has no choice but to leave the Square."
Magazine reports have revealed that Anthony packs his bags after losing everything in a game of poker with Derek and Joey.
The storyline revisits the character's gambling problem, which first became apparent on screen last year.
Lapinskas, who has already filmed his final scenes, recently said that he is hoping for a future return to the show.