IMO Kermit and Jenny Were Just friends. Besides, That was a movie for them; the only "real" movie imo was MFS (MMC is up for debate) and the begining aqnd end of TMM (where their watching the film) jenny was an actress, Kermit was an Actor. That explains why Piggy was Kermit's love intrest in TMTM.
Kermit doesn't realily have any woman (willingly) in his life. possiboply with Miss Mousey durring season 2 of TMS, but since they never interacted backstage, so it was most likely just an onstage pairing, like Fred and Ginger.Piggy and Kermit's relationship as of now has probably not changed. I belive, that after the filming of the kiss in MMC, Kermit washed his mouth out.It's something he would do.