Past Tense

How do you say goodbye to the past?
It happened then and this is now so why is it present tense?
You happened once upon a time, I’m living happily ever after but I still can’t get past you!
What is this?
Thought I moved to something better
Found something different
And I Still think of your similar
Wish sometimes that I could hold it
It lies in the crevices of my heart but I can’t quite reach it
It is awaken by the sound of your name
Yes, your name makes goose bumps arise and something like butterflies make me fly to memories of you
Wish I could feel you again
See you look at me again
Taste heaven in your lips kiss again
Hear you say you love me again…
But that was then and this is now
Why is it I can’t get passed the past?