I think it's comparing his love as pure and innocent, and the other person's love as "darker" or less innocent... Said by "we're standing at the gate... you'll meet the darker fate"
I'm also going to guess and say that the impurity of that person's love is masked by other, more innocent things.
"my better half it's true has seen the darker side of you"
Yet He still wants this person's love.
I'm probably wrong, but I'm just guessing...
I think it's comparing his love as pure and innocent, and the other person's love as "darker" or less innocent... Said by "we're standing at the gate... you'll meet the darker fate" I'm also going to guess and say that the impurity of that person's love is masked by other, more innocent things. "my better half it's true has seen the darker side of you" Yet He still wants this person's love.
Sorry, I'm probably wayyy wrong.