Rejection is a one-time event. It works best with an object that represents an event, not a process.
Hanky-panky requires two people. If she rejects it, it implies that he is unfaithful with another woman. Courtship could work, but that is a process or set of ritual steps leading to engagement. Wooing is quaint and old-fashioned. It is more used as a verb (woo), not a noun.