Thanks for your question. I will try to help.
Unfortunately, if you are here on a spouse visa and the relationship has broken down then you are not in a good position.
This is because your visa status is dependent upon you remaining in a married loving relationship with your wife. If there is a separation then once the home office become aware of this then they will curtail your visa (ie. terminate it) and write to you advising of this.
The home office will inform you that you no longer have a right to remain in the Uk and that you have about two months to leave the UK. At this point you would probably have to leave.
Nothing will likely happen until your wife informs them that you have broken up, but once she does you need to be prepared.
You would have to switch to another visa. If you do not have children then this is going to be quite difficult.
The most common form of visa that people apply for in your situation would be a tier 2 general visa (https://www.gov.uk/tier-2-general/overview) which is where an employer offers you a job and sponsorship to stay in eh UK. However, if you do not have a job at the moment and not prospect of getting an employment offer then you would not be able to apply for this.
if you have £200, 000.00 available to invest in a business then you would potentially be able to apply for a tier 1 entrepreneur visa (https://www.gov.uk/tier-1-entrepreneur/overview) . You would actually have to invest the sum in a UK business that you would run, but you could get a visa on this basis. However, you would have to return home to make the application for this visa from there.
If you consider that you may apply for a tier 1 entrepreneur visa then I would use the time now to work out a business proposal and business plan and see an immigration solicitor immediately in person so that you have someone who can represent you when the home office finds out.
I am sorry that I could not have better news for you.
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