yes, I really do mind

I might not seem like I care,

but now that I think about it,

I do mind,

I do care.

You say it's nothing,

but if it is?

Why is it still there?

Why has it not changed?

Maybe for you it's:

When [you're] with [me]

[you] are thinking of [her]

I know it's not true,

but how can I be sure?