Cheating in relationship

Such an agreement is invalid and not enforceable in Court of law.

You have the only option to forgive and forget past and proceed afresh in life. 

Sir can't I file FIR against him?

yes you can file FIR against him , he is in criminal breach .Eeven held in many judgments that  physical relationship under the garb of promise to marry is not consensusal relationship and amounts to rape,though has many other factors to prove. Anyways you file an FIR for cheating and fraud  and he is will be in soup for ever

Under which IPC I can file FIR? Could you please help me out?

First of all when you were aware that he is married guy why you got involved in physical relationship. You should have avoided him until he divorces his present wife. After divorce when he gets married to you then only you should have got involved with him.

Its a mistake done by both of you. But as he is now avoiding you after having physical relationship with you then you can ask for compensation from him in money terms or else you may file police complaint in local police station against him for breach committed by him.

Is there any other option?

What option you want now? Do you want him behind bars? or do you want some compensation?

I want himBehind bar

The promise made by the married person to marry you after his subsisting marriage is dissolved has not been breached by him because his subsisting marriage has not yet been dissolved therefore he cannot be held guilty of the alleged offence.

You pretty well knew that he is a married person and also agreed to marry him after he gets divorced, hence it was a voluntary act from your side, therefore you may have to wait until his marriage is dissolved by a decree of divorce.

The s*xual relationship between you and him was consensual hence he cannot be termed to have cheated you, this is just an extra marital affair with you for the married person.

You cannot take any criminal action against him if he is not willing to be in touch with you anymore.

If you have evidences for having advanced the money then you can legally demand him to repay the same failing which you can initiate legal action to recover the same 

I fully agree with the advise of learned expert Mr. T Kalaiselvan.

It was your conscience decision to have a consensual s*x which do not attract the provisions of cheating or rape as suggested by expert Mr. SAM.

you can sue him for refund.            

He is ready for refund.

But he cheated me and breach played with me. Now I am in depression. I want him to punish.

How will this lady prove that a physical relationship happened in the past and unless the money given by her was through a bank instrument . 

Recover the money, if you can get / prove in the Court.

Other than above, you have the only option to forget the past and move ahead in life.