The Coronation Street actress, who married the former Hollyoaks actor earlier this month, said that they will both have to put extra effort into their marriage to make it work.
Marsh told OK! magazine: "I think there are too many people who are still looking for the fairy tale, and in reality life is not like that. It's hard, you have to work at it."
The couple raise four children together, David, 17, Emily, 14, Billy, 7, and 17-month-old Polly.
Lomas also agreed with his new wife in that he knows marriage will not be easy.
He added: "You do have to work at it. People who have been in marriages for 50 years will tell you themselves that you have to work at it.
"Too many people nowadays just give up. There have been points in our relationship where we could've walked away but we didn't, we said no, we're going to work at it and that's why we're still here and we're strong."