When Caesar is finally seen in the movie he is working, as he tells Cleopatra in the clip above. She mentions that she always imagined him either fighting or loving. He says that he has experience in fighting, but not in loving 'pretty little queens.' (This is another deviation from the historical Caesar, who was known for seducing the Roman wives.)
In the clip above love is mentioned again, and Caesar disregards it again. He has no interest in love, just like the opening title said. He is only interesting in his own ambition. He is unable to cope with love because it does not matter to him. This inability gives him trouble in the movie. Since he does not love Calpurnia, he carries on an affair with Cleopatra.
Caesar with Calpurnia and Cleopatra
He has no attachment to Calpurnia. He was even going to divorce her so he could marry Cleopatra. The only reason he wanted to marry Cleopatra was for his own ambition, so he could gain the wealth and power of Egypt.
Caesar and Cleopatra saluting each other as emperor and empress.