This is all getting too inflammatory so I might as well throw in my two cents before this closes for further replies.
OP, no one on this website is qualified to give you relationship advice because no one here fully knows of your circumstances, your wife's intentions, etc. And quite honestly, it doesn't matter because this here is an immigration forum and even though people feel compelled to offer free marriage counseling, what it comes down to is this: you are receiving immigration benefits because of this marriage, and as such you have TWO things to figure out. One is whether to stay married or not. Entirely up to you. No one's business.
BUT.
In terms of immigration, the only advice anyone here can give you is this: if your marriage is breaking down, you cannot omit this information from Immigration Officers. And if you do eventually get divorced, that's it. You have nothing to adjust from and should return to your home country and figure things out, since your main reason to immigrate (marriage) is now toast. Then, by all means, see where your new relationship goes. If it's real, do the legal immigration process again. Is it going to take a lot of time and money? Yes. Is it going to be inconvenient? Yes.
That's legal immigration for you, and there are no "shortcuts". So don't come up with any extravagant plans to game the system because they always catch up with you at some point.