If your wife gets a smell of what you’re doing, she might claim that you’re cheating on her with another woman and are in a live-in relationship and claim for a divorce where in you cannot plead your case, because there is no escaping the law here. According to the Indian Penal Code, IPC sec.497, the punishment for adultery is imprisonment up to 5yrs. Therefore, men planning to indulge in sexual congress outside of marriage are urged to consider the following:
a) It is only adultery if the said congress occurs with a married woman, without the permission of the husband. Hence, in order to avoid a jail sentence, it’s better to take written consent from him. This makes it legal.
b) It is not adultery if a married man has congress with an unmarried woman or a widow. In such cases, no penalty applies.
c) In case the matter is urgent, and it becomes essential to have sex with a married woman, try to make sure that the said sex is non-consensual. This does not qualify as adultery.
The law is clear with this, but one has to note that under the IPC a woman cannot be prosecuted for adultery, so even if there is proof that the woman has cheated, she isn’t eligible for any punishment.
However since you’re in relationship with a single woman, you would surely escape the punishment, but why do you want to delay the inevitable? You and your wife aren’t happy with each other, so call it a day and take a divorce; in fact when the divorce is mutual, the proceedings would happen fast and you can get involved with the woman you love/like. You’re separated already, but why din’t you initiate the divorce proceedings all this while? I wouldn’t say it would get too bad, but there can be certain complications, so apply for a divorce.