Denis Beaudoin told ABC's "Good Morning America" on Monday that he donated sperm to Suleman during their three-year relationship in the late 1990s because she claimed to have ovarian cancer.
Suleman denied Beaudoin was the donor she used to conceive her children, ABC said. When pressed, she admitted he had donated sperm to her but was unable to have children, the network said.
Beaudoin still wants DNA testing. He said was misled about why she needed him to make three sperm donations "because she couldn't have kids and, you know, it turned into this."
Regardless of whether DNA tests show he is the father, Beaudoin pledged to help Suleman, because "it's hard nowadays to raise two kids, let alone 14 kids."
Beaudoin is divorced and has two children from the marriage.
Suleman has not responded to repeated interview requests from The Associated Press. Her phone has been disconnected and she no longer has a publicist.
All 14 of her children were conceived through in vitro fertilization, with sperm from an unidentified, platonic friend, the 33-year-old mother has said.
Single and unemployed, Suleman gave birth to octuplets on Jan. 26. She already had six other children.
Beaudoin, who said his mother is black and his father is white, claims Suleman's older children bear a resemblance to him. Suleman's father is Arabic and her mother is Lithuanian, according to public documents.
Meanwhile, an organization offering free, constant care for the octuplets and their six young siblings says it.
Angels in Waiting estimates that such care would cost $130,000 a month.
Suleman has drawn the wrath of many in California since word got out that her family will rely heavily on government assistance to pay for raising her kids.
In separate news, a video posted on a gossip Web site shows the Southern California mother of octuplets bickering with her mother about having so many children.
In the RadarOnline.com video, Nadya Suleman is grilled by her mother, Angela Suleman, about why she had so many fertility treatments.
In the exchange, recorded last week, Nadya Suleman grows irritated and says she had the choice to use embryos created with her eggs or destroy them. She says she couldn't bear to destroy or donate any of the embryos.