What happened?

What happened to the love we shared?
To those moments we said we cared?
When i saw you with someone new
You tore my heart in two

Oh how much i regret
The day when you met her
It's my fault why you both met
now I see you cuddling with her

How dumb was i?
I let myself be blind
But no matter how hard i try
I just can't force myself not to cry

I didn't know how big it'll cost
When you, I lost
Wanting myself to let go
But my determination to do so went down below