My deep deep simpathy towards you bro. However this is the advice I can give:
1. You MIGHT be able to get your marriage annuled based on the fact that you have not gone through a proper 'marriage life' with your wife. This is the best scenario of course but it is hard. You might have to get the best lawyer also to be able to pull this thru.
2. There are one very important basis of divorce: that marriage has broken down irretrievably (woman charter section 88). And to prove this she needs to have any of the 5 facts: adultery (which you din do), unreasonable behaviour (this is rather vague, you still have to find best lawyer for this), separation for 3 yrs with consent or 4 yrs without consent (nope), desertion for 2 yrs (nope).
At such I would think that she will try to fight the case thru the basis of unreasonable behaviour. You would need to fight the case in this basis, bro.
3. NEVER sign the document without a lawyer. You would CONFIRM have to give at least 1/2 of the total wealth you have AFTER you are married plus maybe maintanence fees everymonth (luckily no children).
I think you have good chance to fight man. I would think engaging PI will provide a more solid eveidence on the unreasonable behaviour on her part. Sad to say most likely she will get a part of what you have. But dun let her without a fight, half is just too much for this case. Tell me if you need more advice bro, I might be able to find contact for a good lawyer.
PS. We should have Men's Charter!