Dexter is the boyfriend of Kim Fox. They appear together for Kim's sister Denise Fox's wedding to Lucas Johnson. Upon his arrival, Dexter instantly sets his eyes on Kim's niece Chelsea. At the wedding reception Dexter flirts with her but she turns him down and threatens to tell Kim about his advances. At this point he instantly feels threatened and backs off. Following the reception, Dexter and Kim stay overnight to see Denise and Lucas leaving for their honeymoon the next day. Chelsea tells Denise about Dexter's behaviour towards her and Denise tells Kim about this. Even though Kim already knows the way Dexter behaves to other women, she still loves him. After a family dinner and seeing Denise and Lucas off, Dexter and Kim return home. Several months later, Kim returns to Albert Square and reveals she has separated from Dexter.