If you are living with a married man or woman, but all people involved are civil and amicably separated, are you still committing adultery?
According to Jesus Christ Himself, He described adultery as Luke 16:18 Whosoever putteth away his wife, and marrieth another, committeth adultery: and whosoever marrieth her that is put away from her husband committeth adultery.
So if you are living with a man who divorced his wife, you are also committing adultery. There is an exemption though.
In Matthew 19:9, Christ said. Mat 19:9 And I say unto you, Whosoever shall put away his wife, except it be for fornication, and shall marry another, committeth adultery: and whoso marrieth her which is put away doth commit adultery.
If the reason for divorce is due to sexual immorality, the innocent party can divorce the guilty party. And the innocent party is free to get married again.
I hope this helps.