Not sure, I don't know

It felt like we were back to how we used to be.
But still, I don't feel sure about it.
Perhaps I've gotten used to life when you were away.
Now you come back,
I cannot open my arms and say:Welcome back.
Though I seem so,
but I really cannot do it.

During the time when you were away,
I've learnt how to put on the shield,
and to also put it on well enough,
because I know I need to protect myself.

One day,
we'll say goodbye.
The memories we've created,
they'll be locked up somewhere.
As time goes by,
it may fall asleep,
it may never wake up.

But till that day comes,
I promise you that I'll try my best.
Try my best to spend the times we have left to the fullest,
because having regrets in life will cause pain in the future.

And I don't want that to happen.
Really, I don't want.