Brotherly Love Lost?

After reading Act IV, I was shocked to discover that Kent could go against his own brother to help Mortimer.

"And certify what Edward's looseness is.
Unnatural king, to slaughter noblemen
And cherish flatterers! Mortimer, I stay
Thy sweet escape. Stand gracious, gloomy night,
To his device!" (Act IV, i, 7-11)

I understand Kent's frustration of Edward's decision to terminate "noblemen" for his minion, but to take it to the extreme of actually helping the man who could be responsible for his brother's death is something I did not expect.

But later, we see that Kent starts to reflect his decision,
"This way he fled, but I am come too late.
Edward, alas, my heart relents for thee!
Proud traitor Mortimer, why dost thou chase
Thy lawful king, thy sovereign, with thy sword?
[To himself] Vile wretch, and why hast thou, of all unkind,
Bourne arms against thy brother and thy king?" (Act IV, vi, 1-6)

We can see that he truly doesn't want to betray his brother, but he thought it was the best for the monarchy. He refers to himself as "unkind", which we blogged about earlier, meaning his betrayal is more unnatural and cruel than Mortimer's. I'm interested in seeing what happens, and how and if things will change for Kent.