Waterloo, by ABBA

This is one of the most popular songs of the 20th century, performed by the Swedish group ABBA. Explain what does it mean when someone use the phrase: "FINALLY FACING MY WATERLOO".

Lyrics:
My, my, at Waterloo Napoleon did surrender
Oh yeah, and I have met my destiny in quite a similar way
The history book on the shelf
Is always repeating itself

Waterloo - I was defeated, you won the war
Waterloo - Promise to love you for ever more
Waterloo - Couldn't escape if I wanted to
Waterloo - Knowing my fate is to be with you
Waterloo - Finally facing my Waterloo

My, my, I tried to hold you back but you were stronger
Oh yeah, and now it seems my only chance is giving up the fight
And how could I ever refuse
I feel like I win when I lose

Waterloo - I was defeated, you won the war
Waterloo - Promise to love you for ever more
Waterloo - Couldn't escape if I wanted to
Waterloo - Knowing my fate is to be with you
Waterloo - Finally facing my Waterloo

So how could I ever refuse
I feel like I win when I lose -

Waterloo - Couldn't escape if I wanted to
Waterloo - Knowing my fate is to be with you
Waterloo - Finally facing my Waterloo