I cannot understand this part of the song completely
Vete, olvida que existo, que me conociste,
Y no te sorprendas, olvida de todo que tú para eso tienes experiencia...
This is my attempt:
Y no te soprendes = and do not be surprised, do not pretend that you are surprised, or an order do not be surprised (why I behave like this)
olvida de todo que tú para eso... =?
forget everything that you because of that have experience(experienced?)
forget everything because of which you have such experience
forget everything that allowed you to have this experience (of missing me)
In essence how would you say the same precisely in English, explain what she meant if needed be, I do not see connection with "and do not be surprised"