Never bored

This rollercoaster we are on
Will never cause you to yawn
It may have its dips
But as long as you sit
You'll never be fazed
But always amazed
You'll have the world
Always be on a whirl
You've never seen these highs
Because I will always try
Never recant
Never take you for granted
Always know
That I will show
The tenacity
The capacity
To keep you on your toes
Because one day soon I'll propose
You'll never be bored
With what I have instore