Brutus has one of the men tell Cassius to send his army off early in the morning, and Brutus’s army will follow. It seems Caesar's ghost has only cemented Brutus’s willingness to meet his fate, whatever it be.
I sympathize with Brutus. He has done wrong but he is our tragic figure and lives with the repercussions. He also did what he believed was best for Rome.
...
I hope this helps.