[Flowers in December (interpretation needed)]

It's a dreamy and hypnotizing song,both depressing and bittersweet. But i can't really get the exact meaning of the song. what's the interpretation of it?

Flowers in December---mazzy star

before I let you down again

I just want to see you in your eyes

I wouldn't have taken everything, out on you

I only thought, you could, understand

they say every man goes blind in his heart,

and they say everybody steals somebody''s heart away

and I got nothing more to say about it

nothing more than you and me

send me your flowers, of your december

send me your dreams, of your (candlelly wine)

I got just one thing I can't give you

just one more thing of mine

they say every man goes blind in his heart

and they say everybody steals somebody's heart away

and I''ve been wondering why you let me down

and I''ve been taking it all for granted

I don't know whether it expressed the confusion of the singer why her love leaves her without saying a word and explaining anything. Or it's only about a crush on someone?

i wonder that"I got just one thing I can't give you /just one more thing of mine " what is one more thing ?her love ?

"take it all for granted" take what for granted here?