Oberon wants Titania to fall in love with some vile things as revenge because Titania refused to give him the Indian Boy.
Hermia insists that Lysander sleep away from her because they are not yet married and she thinks that would be pushing things.
Puck anoints Lysander’s eyes because he thought he was Demetrius and he was trying to get Demetrius to fall in love with Helena.
Helena believes that Lysander is just mocking her.
Hermia dreams that Lysander left her, which is reflected in what actually happened.