In Undercover Principal, Part 2, Miss Tingley is seen massaging Haney's shoulders, then consoling him and helping him with his problems.
During the Ratwater series, Ratburn and Sweetwater declare to Principal Haney their love for each other, only to find Haney and Tingley embracing on Haney's desk. Both couples are shocked, and they form an agreement to keep both relationships secret from the rest of the school, so they can all keep their jobs (Ratwater, Part 5). They haven't addressed the issue since.
While going on a double date with Miss Sweetwater and Mr. Ratburn, Miss Tingley got territorial when is appeared that Miss Sweetwater was trying to steal her boyfriend.
Miss Tingley continues to be highly territorial of Haney when Sweetwater gets to close to him (Revolution, Part 3). Later, Haney dumps Tingley for Miss Sweetwater, because he was "true love's kiss" (Revolution, Part 5).