Police attitude?!

Yes, the police came across to me as abusive, as if they were looking for an excuse to subdue the kids. However nothing much seemed to happened out of that because on the next scene, they all seem unaffected by it.

But I guess the police incident was the final straw for Lydia. Because of that and all the pressure she was going through, I think she may have turned down Krimo just for the sake of some peace of mind and therefore Krimo gave up on both her and being in the play, because another boy took his part. Neverthless he refused to go back to Magalie and she eventually moved on with the other guy.

In the last scene, I believe that Lydia, done with the play and released from the pressure, felt more willing to give Krimo a chance in the future.