Jahmene, who was runner-up in last year's show won by James Arthur, was mentored by singer Nicole and the pair remain good friends.
In an interview with today's Mirror, Jahmene reveals that he has helped Nicole in the aftermath of her painful split with Formula 1 racing driver Lewis Hamilton.
Asked if Nicole is still hung up on her ex, Jahmene replies: "I know that she is in love with Lewis. And I've been with her as a friend while she was with him and when they broke up.
"I am trying to be there for her because it is a tough time. It isn't easy to switch off after spending five years in a relationship. I think it was just obvious that the distance thing might have taken its toll."
Jahmene, 22, added: "But she's a strong woman and she's not silly. She is very into her faith so she knows how to get through something and just needs the right friends around her."
In the interview, Jahmene also talks about his difficult upbringing with an abusive father, his vow to stay celibate until marriage and his role as an ambassador for the women and children's charity Women's Aid.
Nicole split up with long-term boyfriend Lewis in July, despite rumours that he was about to propose.
Since the breakdown of their relationship, Nicole has admitted she's "lonely" without Lewis, while he has posted a number of cryptic tweets which seem to allude to his broken heart.
Nicole appears on Jahmene's new album which has gone straight to number one.
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