Without A Trace Lyrics

How can it be that once you said you'd be there for me.
Made me believe that I was all that you'd ever need.

[ Lyrics from: http://www.lyricenter.com/e33090-trish_thuy_trang~without_a_trace_lyrics.html ]
I was so blind to give you all my time and my heart.
There were no signs no clues that you'd change your mind.
Said that I could be that one and then

Without a trace in an instant you were gone and there was nothing for me to say.
Your love disappeared into thin air and just vanished without a trace.

How can you say those words and turn and just walk away.
Feeling no shame, no proof no evidence of my pain.