Right Side of the Bed

I believe this song can be interpreted in different ways, but my first impression of it goes like this: A guy is in a relationship and it goes great at first

--"I say goodbye to what we had"--

but then something changes. This girl apparently has alot of baggage and drinks because of it -maybe-. He watches her dancing knowing somthing has changed, but he doesn't know whether to let go or not-

--"gazed upon with dead lover's eyes. She never looked so good, And I never felt so right.

I felt so wrong"--

Because he remembers how it used to be between them-

--"I just want to forget and let go Of all the joy, of all the pain...

I say goodbye to what we had"--

But now she has changed and he doesn't realize it until now because he's been holding on so tightly to her past self--

--"Sometimes when you're holding on, You'll never see the light"

I believe the whole song's message is basically that sometimes your holding onto a relationship so tightly, that you don't realize the other person is changing and your growing apart, so it ends up in a downward spiral, but you won't let go of all the happy, past memories.