What to do

I like you.
No, I love you.
But theres also her.
Her.
We chased each other for so long.
Told each other how soon we would be together.
I established and built from the base up,
All of the conversations and time spent together.
If I love you,
Everything I had with her will be gone.
Is that a sacrifice to make?
To let all the time I put into this just slip and go to waste?

What to do..