can anyone help me find this song/artist ?

Hello , Im looking for a song title and artist if anyone can help me id really really appreaciate it . been looking everywhere on everything for months now .
this song plays at work everyday, it is sung by a female artist possibly country (not sure) it is a sad love song very slow and sounds alot like martina mc bride and allyson krauss but it is not .....

here are the words I know not all in order though
(chorus)
Some times I wonder .... If only , we were much stonger ,if only we held on longer if only I would have known then what I know now ....
i think, back to when we had it all
we were so wrong , look what we have done we went sperate ways , its so sad
sometimes I wonder (repeated chorus )

(then the end says ) If only id known ,How id miss you ......
P.S. it says "If Only" alot in this song
you can email me at shoppinglife1@aol.com or reply here either way
thanks so much