Love is key

I have a song stuck in my head and I have no clue what it is, if you can tell me, please PLEASE do so:

You are the cornerstone of my life
You are my backbone, lover and wife
You make your home where I reside
....

And in this age were marriage is done
I search this commitment of mine
Til death plays it's part
You have my heart
...

And that's all the words that I can remember. The tune is firmly in my mind though. I'd truly appreciate it if someone could tell me the name because a search on the internet has drawn a blank also.

Created in Sterlingware