Derulo was dating model Jordin Sparks during the time of the song’s release, which gives insight into the song's sincerity and genuine feeling of romance.

And you know one of these days, when I get my money right
Buy you everything and show you all the finer things in life
Will forever be enough, so there ain't no need to rush
But one day, I won't be able to ask you loud enough

I'll say, will you marry me?
I swear that I will mean it
I'll say, will you marry me?

Singing, uh-oh-oh, uh-oh-oh
Uh-oh-oh, oh-yeah

How many girls in the world can make me feel like this?
Baby, I don't ever plan to find out
The more I look, the more I find the reasons why
You're the love of my life

You know one of these days, when I get my money right
Buy you everything and show you all the finer things in life
Will forever be enough, so there ain't no need to rush
But one day, I won't be able to ask you loud enough

I'll say, will you marry me?
I swear that I will mean it
I'll say, will you marry me?
And if I lost everything
In my heart, it means nothing
'Cause I have you, girl, I have you
To get right down on bended knee
Nothing else would ever be better, better
The day when I

I'll say, will you marry me?
I swear that I will mean it
I'll say, will you marry me?
I'll say, will you marry me? (the day I get on my knees)
I swear that I will mean it

I'll say, will you marry me? (and what you do me, baby?)
Got me singing (uh-ooh, uh-ooh)
Got me singing (uh-ooh, uh-ooh)
Would you marry me, baby? (uh-ooh, uh-ooh, uh-ooh)

A hundred and five is the number that comes to my head
When I think of all the years I wanna be with you
Wake up every morning with you in my bed
That's precisely what I plan to do

Jason Derulo, Jonas Jeberg, "Hookman" Marlin Bonds, Andy Marvel wrote the song, while the song's production was handled by Jonas Jeberg.

Wikipedia

The Meaning Behind The Song: Marry Me by Jason Derulo - Beat Crave