Won't Last Long lyrics

You and me been over this ground
Over this ground before
I cant explain
I cant explain
I cant explain anymore
Oh its hard to watch you go

Im down but it wont last long
Im down but it wont last long

Dont let me down
Dont let me down
Dont let me down like this

Its not the same
Over and over
Over and over again
Yeah, this is not my day

Im down but it wont last long
Im down but it wont last long

Half my brain has gone away
Half my brain has gone
So far away

Dont let me down
Dont let me down
Dont let me down again

Dont shake me up
Dont burn me out
Im hurt and you wont let me in
Yeah, this is not my day

Im down but it wont last long
Im down but it wont last long

Submitted by Guest

What do you think is the meaning of Won't Last Long by Tom Petty?