How?

It'd been 3 weeks since we talked last
That's a lot of time to pass
Last night i cried to thoughts of you
I feared the worst and became blue
When my phone rang, I was surprised
To hear your voice on the other line
I felt relief that you were OK
And then you said to my dismay
"I'm done with you, it's over now"
I started to stammer, "But I didn't, how?"
Then i could tell you hung up the phone
Tears fell from my eyes, I felt so alone
And I didn't realize until just now
I didn't do anything, I still don't know how