1 Samuel 15-16

So Saul is pretty much going downhill. He disobeys the Lord and Samuel is pissed! "Does the Lord delight in burnt offerings and sacrifices as much as in obeying the Lord? To obey is better than sacrifice, and to heed is better than the fat of rams..." 15:22
The Lord is displeased as well, "And the Lord regretted that he had made Saul king over Israel." 15:35. I don't really understand how the Lord regrets through... That doesn't make sense to me.
For the rest of his days Samuel never sees Saul again. In chapter 16 he anoints David "and from that day on the Spirit of the Lord came on David in power." 16:13 And then David goes to work for Saul as his armor-bearer...