Have extra marital affair with colleague and wants to be safe legally

first if you are married then it would create more problem for your. Better you give more history of your case so we can reply properly .....

i also want to know whether you both are living in live in relationship or what ??

Firstly you have to know provision of IPC as

497. Adultery.—Whoever has sexual intercourse with a person who is and whom he knows or has
reason to believe to be the wife of another man, without the consent or connivance of that man, such
sexual intercourse not amounting to the offence of rape, is guilty of the offence of adultery, and shall be
punished with imprisonment of either description for a term which may extend to five years, or with fine,
or with both. In such case the wife shall not be punishable as an abettor.

So you have to keep away from her.
For further query contact the lawrato

As per indian laws it's illegal to have extra marital affairs.
It's good for you if you come out of such relationship otherwise it may cause serious effect on your relationships with your wife.
Your wife may file divorce application on this ground since it is called bigamy under indian penal code.
It's priama facie advise to you more advise can be provided with more clarity from your side.
Keep away from such relationship.