Arthur later let slip the truth to Ruby who confronted Kat and demanded she contacted Stacey.
While they argued in the Square, Stacey, who was sporting an expensive attire, appeared.
Stacey ended her marriage to Martin when he told her he’d cheated on her in a bid to keep her safe.
However, when Martin discovers Stacey went to all the trouble of impersonating Ruby to get revenge for their budding romance, will he realise he still has feelings for her?
EastEnders continues Tuesday on BBC One at 7:35pm.