What does peter talk of that makes annes heartbreak; he thinks about dying, he talks of being a criminal and gambling, he speaks of marriage, talks about leaving

this is anne frank btw

The answer is "talks of being a criminal and gambling".

Annelies Marie "Anne" Frank was a famous diarist who wrote her accounts of the holocaust and is known to be one of the most discussed holocaust victims of the time. Her diary was published under the title of "The Diary of a Young Girl", which gained immense fame.