He is due to be sentenced later today (Friday).
Naseem stayed in the flat for 12 hours after Ms Abbotts died and pretended to be unconscious when police broke down the door, the court heard.
Jurors at Lewes Crown Court heard Ms Abbotts suffered more than 13 wounds to her head and 20 other injuries.
Naseem, of Amersham, Buckinghamshire, claimed he was acting in self-defence after Ms Abbotts tried to strangle him during a sex game.
The Guardian reports that the victim, who was born in the West Midlands, was described as a socialite who led a party lifestyle in London, mixing with wealthy friends, and telling relatives she worked in IT.
But secretly she advertised her services on an adult site under the pseudonym Tilly Pexton.
Naseem was working for Toronto-Dominion bank’s London office when he found her profile. The pair were last seen in public on the evening of 24 May when Naseem met her in Crawley before spending the night together.
Naseem is due to be sentenced on Friday.