'GBH with intent' is a very serious offence. It's only one step below 'attempted murder' and carries the same maximum penalty of life imprisonment. So anyone convicted of the offence can expect to receive a lengthy prison sentence.
When sentencing your ex-boyfriend, the judge will refer to this document:
http://www.sentencing-guidelines.gov.uk/docs/a ssault-against-the%20person.pdf
It's the table on page 13 which is relevant. The judge will need to consider whether your injuries should fall into the 'very serious' or 'life threatening' category. I suspect that the latter will apply. If so, that gives a 'starting point', for sentencing, of 8 years custody, with a range of 7 to 10 years possible.
However, those sentences apply to
first time offenders, convicted after a trial. The earlier assault is likely to push the sentence upwards. My guess is that a sentence of around
9 years will be passed.. If so, your ex-boyfriend will probably actually spend between 4� years and 6 years in prison (including the time spent on remand).
Even if your ex-boyfriend has an exceptionally good barrister (and appears before an exceptionally lenient judge), I can't see how a sentence of less than 5 years could be passed.
Chris