How we cite our quotes: (line)
Quote #1
I scarce believed thou couldst be gone away ; (line 2)
The speaker starts out in a state of shock, but we don't know what type of shock it is. If his lover has died, then he is having trouble imagining a world without her in it. He doesn't know what to do now. But we think it's more likely that she is alive, but separated from him for a day, so his shock and disbelief are more complex and difficult to understand.
Quote #2
Tears drown'd one hundred, and sighs blew out two ;
A thousand, I did neither think nor do, (line 5-6)
The speaker falls into a "woe is me" complaint that seems typical of many a young Romeo who wants to sound dramatic. He weeps and sighs a lot, which are clichés of melancholy and despair. He's not trying to differentiate himself from all the other lovelorn guys out there.