The 'Les Miserables' actress and the 33-year-old model enjoyed a brief romance earlier this summer but David - who has previously dated TV presenter Laura Whitmore and The Saturdays singer Mollie King - insists he is single.
He told the Mail On Sunday newspaper: ''I am single at the moment.
''This summer I am going to Los Angeles and then New York. Samantha's gone to LA now and if I see her in LA then I see her in LA . . .
''I am not going to go out of my way to see her, but if I bump into her, I bump into her.''
However, Samantha, 22, isn't short of male admirers with renowned lothario Russell Brand recently revealing he had a crush on her.
The comedian - who was previously married to Katy Perry - took a shine to the actress after he spent most of the post-Oscars Vanity Fair party in Los Angeles in February flirting with the ''bedimpled angel''.
He said: ''So many ladies caught my eye; it was like an assault on the senses. But I like that girl from 'Les Miserables', Samantha. We chatted and she's from the Isle of Man.
''She's like a bedimpled, little Manx angel. She was a lovely, beautiful young woman.''
The BBC drama starring Aidan Turner returns to BBC One on September 4th.
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