After I heard this song I agreed with your opinions . But after I saw official video and short movie I wondering if it is correct meaning. I have two opinions.
1.Official video- Maybe he cheated her. She throwing books and she yelling at him. And, at the end he cry. Maybe this solving line "But I'm just so tired to share my lines". And lines "
On another love, another love, All my tears have been used up" maybe means he "spend" his emotions and feeling to someone else.