| Quote #1
But stirr'd by Cleopatra.
Antony’s reputation at one time rested on his noble work as a soldier, with all the Roman austerity and severity that came with it. His life in Egypt (or his love) has transformed him into a man that wants pleasure all the time, which is indulgent, but also completely contrary to the Roman way.
| Quote #2
Caesar criticizes Antony’s decadent actions in Egypt, but the hint is that these are things natural to Egypt (and thus unbefitting a Roman). This decadence is also characterized by its femininity, which is linked to an Eastern way of life, and a polar opposite to the Roman austere ideal, which is linked to masculinity.
| Quote #3
Antony, in a very chivalrous fashion, sends his love to Cleopatra. He presents her a decadent bauble of a pearl (befitting the East), but it’s important that as he sets on his journey out of Egypt, he identifies himself as a "firm Roman." He goes as a soldier, and thus is leaving behind the decadence that characterized his life in Egypt, trading it for Roman austerity. He hasn’t forgotten her (and the East) in spite of this transformation; hence the gift.