Why did the influential Abner leave Saul’s son, the new king, and join David?

ANSWER

He accused Abner of sleeping with his father’s concubine

2nd Samuel 0 :

7 Now Saul had had a concubine named Rizpah daughter of Aiah. And Ish-Bosheth said to Abner, “Why did you sleep with my father’s concubine?” 8 Abner was very angry because of what Ish-Bosheth said. So he answered, “Am I a dog’s head—on Judah’s side? This very day I am loyal to the house of your father Saul and to his family and friends. I haven’t handed you over to David. Yet now you accuse me of an offense involving this woman! 9 May God deal with Abner, be it ever so severely, if I do not do for David what the LORD promised him on oath 10 and transfer the kingdom from the house of Saul and establish David’s throne over Israel and Judah from Dan to Beersheba.” 11 Ish-Bosheth did not dare to say another word to Abner, because he was afraid of him.
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