The reason Miyabi Fujisaki a. Alucard broke his promise is sadly simple.
Miyabi he knew the Rosario couldn't control Alucard, he no longer saw his deal with Akua as benefitting him to be kept. It's like some old westerns: Once the threat to the bad guy is gone, penis free porn double-cross is "par for course".
Also, Miyabi, as Alucard's clone, retained his ruthless cruelty and arrogant fujisaki to be powerful. After all, the original Alucard consumed multiple monsters to become stronger, but lost human like form in the process. You mean, "Why did he break his promise"?
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