Let me see if I can combine these a bit, since you only get one question. Cyrano claims he's mad at the world and doesn't care in the least what it thinks of him. He asks Le Bret if he's supposed to do what all the "common" poets do: find a patron and be beholden to him for every crust of bread; write poetry for people in order just to bring home a paycheck; write ridiculous poetry for public display and to make people laugh; spend his time groveling and begging. In short, is he to
"...Scratch the back of any swine
That roots up gold for me?" (Act II)
He rants and raves against these awful fates, then Cyrano tells us what he does want:
"To sing, to laugh, to dream,
To walk in my own way and be alone.
Free, with an eye to see things as they are...."
Cyrano says he loves hatred: "It is my pleasure to displease." But after the tirade, and
"(After a silence, [Le Bret] draws Cyrano's arn through his own.) Tell this to all the world--and then to me
Say very softly that...She loves you not."
All his posturing is a bluff to hide his hurt that the one he has chosen to love does not love him in return--and it is not likely she ever will. This, then, is why he acts the way he does.