This was the first episode that made me miss Christy because 1) she wouldn't have went a long with stalking Andy 2)she would have tried to stop it and 3) if she couldn't, she would have gotten Marjorie involved much sooner to put a stop to that foolishness.
Jill is obviously suffering from abandonment issues: her mother committed suicide, her husband left her, so IMO her behavior wasn't born out of jealousy, but fear. It would be interesting if the show could have her address this with Trevor. It's a very real thing and can be crippling. I was actually really angry at Tammy and Bonnie for