Havisham is about a woman who was going to get married but got left at the alter. The poem shows her desperation and anger. It describes how it keeps coming back to her.
An oxymoron - 'sweetheart *******' - is used in the first line to emphasise the difference in how it is to be loved and dumped. It shows her anger to the man.
The poem also says 'I've dark green pebbles for eyes' saying that she's jealous of people in love. The way she has used the word 'dark' shows her anger, and she wants revenge!
The word 'Nooooo' is used to show that she's desperate and mourning for him. It is also Melodramatic.
'Who did this, to me?' is also used. 'to me?' is on a different line, so this emphasises it and shows her desperation. It also asks the reader why?
In the last stanza it says 'red balloon bursting'. This is a metaphor for her heart breaking.