Would you explain what the underlined mean easily in the lyrics of "My heart will go gon"?

This music is "My heart will go on" sung by Celine Dion .
I can see them , but I need to understand the mean of them for sure. Please help me.
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Every night in my dreams
I see you I feel you
 That is how I know you go on
Far across the distance and spaces beteen us
You have come to show you go on
Near far wherever you are I believe that the heart does go on Once more you open the door And you`re here in my heart
And my heart will go on and on
Love can touch us one time and last for a lifetime
 And never let go till we`ve gone
Love was when I loved you
one true time I hold to
In my life we`ll always go on
You`re here there`s nothing I fear
And I know that my heart will go on
We`ll stay forever this way
 You are safe in my heart
And my heart will go on and on
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