How is Peter preventing the success of Anne?

I don't know about Anne's success, but in Scene Three, Peter acts immaturely and gives everyone a hard time. Anne attempts to be social, but she is thwarted at every turn. Peter slams doors, isolates himself with his cat, and is incessantly teased by his mother over his supposed crush on Anne. None-the-less, in this scene, Peter refuses to give anyone a break.