Breadcrumb: Where'd my wife go?

At the end of 1 Sam. 25, we find out that David has taken two new wives: Abigail (wife of the now-deceased Nabal), and Ahinoam of Jezreel. But what about David's first wife, Michal? We might recall that David married Michal, Saul's younger daughter, in 1 Sam. 18. But now it seems that Saul has voided the marriage and given Michal to Phalti, the son of Laish. We have no news about why the marriage was voided, though Saul's murderous jealousy of David might be some indication. Indeed, we don't even know how David reacted to the loss of his first wife. All we can hope is that the two new ones made up for the loss of the old one.