The strongest words

Ive been there for a while, and I didn't see it.
I didn't see it and I wonder why.
Then you came from nowhere, and your eyes showed it all.
The feeling you had for a while. We sat there and looked around ,we felt it but we didn't know how, and why.
And then it came the 3 strongest words you can say.
You looked me in the eye and made me believe it.
What was it. Well Now I know the 3 strongest words were a lie.