In the prom episode at towards the end of the show, were Jessie and Slater still going out, or were they just friends?

In the prom episode, Jessie and Slater were now considered an item, even though he still had little feelings for Kelly, who now goes out with Zack.

Wait a minute, Slater had feelings for Kelly? Maybe I'm just being delerious, but I don't remember Slater ever having feelings for Kelly. Slater always called Jessie "momma". I don't remember Slater ever liking Kelly.

Slater and Zack always used to fight over Kelly in the begining. When Kelly decided to go to the prom with zack, Slater gave up and went with Jessie instead-even though they always argue.