The singer and his JLS bandmates split just before Christmas, meaning his new job on the BBC1 show couldn't have come at a better time.
Marvin and his wife Rochelle Humes, who is one fifth of The Saturdays, are parents to eight-month-old daughter Alaia-Mai and he hopes opportunities such as these will give her a great future.
"Rochelle and I have never come from privileged backgrounds and we have worked very hard to get to the position we are now in," Marvin says.
"As a dad, you get the sudden responsibility. You want to look after your nest. We want the best for our daughter and we will keep working hard so she can have the best things in life."
Marvin found fame almost seven years ago after he and his JLS bandmates - Aston Merrygold, Oritsè Williams and JB Gill - auditioned for The X Factor.
Given his experience on the reality show, Marvin feels he can thoroughly relate to the contestants on The Voice.
Marvin says: "People can look at me and think, 'He has done it before, he has seen it before'."
"Whenever people meet me, they ask me questions about how I felt in my first audition. It is really cool I can do that.
"I know exactly what they are going through, what the family is going through and I know how much it means to people. I was in their shoes."
Marvin also admits he and Emma have offered their shoulders to cry on to many contestants who haven't made it past the judges - will.iam, Tom Jones, Kylie Minogue and Ricky Wilson.
"Unfortunately there are more nos than yeses. There have been a lot of tears and it has been emotional for Emma and me," Marvin admits.
"We see all the contestants before they go out. As hosts you do get attached to them.
"Obviously, when they go through, it is sheer joy and adulation. Everyone goes nuts. But when they don't get through, it is heartbreaking and it is really sad."
The Voice, 7pm, BBC1, 11 January 2014.
Rochelle and Marvin: Their romance in pictures
Copyright: Instagram / Rochelle Humes