who does jackie end up with in the books

Jackie ends up with Cole in the books, although their relationship is left somewhat open-ended. Before leaving for New York, Jackie confesses her feelings to Cole, and they share a kiss. They officially end things with Alex on good terms, and while Jackie leaves for New York, it is implied that she and Cole will keep in touch and possibly rekindle their romance in the future. The books do not show a fully settled relationship, but it clearly favors Cole as her choice over Alex.