What is Brutus's internal conflict / inner conflict in Julius Caesar?

In "Julius Caesar" Brutus has internal struggles about his feelings for Caesar.  Part of the problem within Brutus is the fact that he can be influenced, a fact that Cassius is aware of:  "Who is so firm that cannot be seduced?" (I,ii,312) Thus, Cassius persuades Brutus that Caesar is "ambitious" and desires to be crowned as a king and become a tyrant.  In the second act,scene i, Brutus in soliloquy ponders the idea that Caesar seeks power.  He reasons

I have not known when his affections swayed/More than his reason.  But 'tis a common proof/That lowliness is young ambition's ladder/Wereto the climber upward turns his face;/But when he once attains the upmost round,/He then unto the ladder turns his back,/Looks in the clouds, scorning the base degrees/By which he did ascend.  So Caesar may(ll.22-27)

Brutus worries that once Caesar is given so much power, he may forget "the base degrees," the events and people who helped him ascend. So, he decides that Caesar is like "a serpent's egg"(l.32) and the senators must "kill him in the shell" (l.34).  Once Brutus reaches this decision, he is still troubled because he does love Caesar.  Finally, he decides to put the welfare of the state above his personal feelings.  The irony to this is that Brutus is unsuccessful in his leadership and dies tragically himself.