In the play The Diary of Anne Frank, how does Anne and Peter's relationship change over the course of act 2, scenes 1 and 2?

In the play The Diary of Anne Frank, Anne and Peter's relationship changes in act 2, scenes 1 and 2 because tension in the annex is growing among the adults, and the fact that the children are also maturing. For example, after Peter accidentally smashes a light that scares a burglar away, Mr. Kraler announces in scene 1 that a workman wants blackmail money not to report them. Dussel blames Peter, which starts an even bigger argument, and soon everyone is yelling. As a result, Anne blows up at the adults and storms off. Peter takes her the piece of cake she left behind, and this is when they first confide in each other about their struggles living in the annex with such stressed adults. 

By the second scene, Anne is shown trying on clothes with Margot and getting ready for her first date with Peter. Then, during their meeting in Peter's room, not only does the couple talk about kissing and proper courtship, but they also talk about friends and having seen each other at school before going into hiding. They discuss how each one felt about the other when they first met compared to becoming interested in each other, now. They realize how much they have matured while in hiding. This date helps to close the chapter on their past, in a way, as they approach a more intimate relationship at the present. Happily for Anne, she leaves after receiving a kiss on her cheek from Peter. The kiss definitely symbolizes growth and intention towards their new relationship as they leave their more immature one in the past.