Is this due to Extra Marital Affair ?

As a new mom I can say my opinion. Women's need their partner support during their post delivery time. During this time they have many mood swings and all. If u r not there that time they feels unsafe and later it will affect relationship between them.

Women need someone to be "there" during difficult times, else they move on, at first, emotionally. That's the harsh truth.
On the surface, she could give any reason, but emotionally she had moved long ago.
(I'm a man, just telling from experience)

First thing first, be strong, don't break down and affect your work and overall well being.
Your daughter should be your Priority. So in case if you wife have any afair , you need to get your daughter's custody.

I suggest hire, reputed private detective to track your wife movement, to gauge things. This will cost you multiple lakhs Rs based on duration, you will have to track. But as you have returned from onsite, I guess money should not be an issue. If you get some proof that your wife is having affair, that will become strong case to get custody of your daughter

Hope things turn on better path and any misunderstanding will get sorted out. Try to involve her close family members , friends for patching related discussion.

There is so much to do in this short life. Don't creep for your wife and daughter. Your daughter is in safe hands and a mother can take care of your daughter way better than you can. Set your goals and move forward, don't look back and cry over spilled milk.

I am not sure of the reason exactly but what I feel is she has lost the bonding with you and no longer interested to live with you. Maybe you could have left her alone and would not be there when needed that would have hurted her a lot is what I feel. You could have done some mistake, talk to her, clarify and try to console. Get down a bit if you want your life back with your wife and daughter

You are money minded , left usa leaving alone wife.. not there during her difficult times .. simple she hates you now

A woman who is in love with you will not leave you for whatever reason. If she does eventually leave you perhaps there was no love in the first place. So you don't lose anything if you lose her. You should talk to her and resolve her concerns and your queries without judging. Marriage is a sensitive and personal matter and any relationship takes time to build. Did she visit you in the US? Was there a strong reason you couldn't live together in the US? Was it a mutual decision? Did you give her what she wanted or impose your decision? How did she live away from you? How did she go through the delivery without her strongest support? - all these are questions for your introspection. Apologize to her sincerely for not understanding and pray that she accepts.

Your daughter is another matter altogether. I don't think you should bring her up for discussion till it's clear how the two of you stand as a couple. I do Hope it works out, but if it doesn't please don't dwell on it and ruin your life. Sometimes love once lost is lost forever. Other times it just takes time.

After you have understood the above ask yourself if the extra marital question deserves a response. Respect your wife, respect her choices.

I have no intention to be insensitive or hurtful here. If I have been, I apologise.

How did you leave your wife when she was 6 months pregnant? And what are you expecting now rather than divorce?

Don't get me wrong, but on your part it looks like you didn't tried to support mother or daughter enough during and after pregnancy. Normally US born kids have advantages so you should have taken your wife if she was already pregnant. Assuming that you both choose this that she will stay here, you shd have tried to take her back to us first time you got the opportunity. Now after separation of years with your wife managing it alone, I can understand that she doesn't feel emotionally connected enough and that in my opinion is reason good enough.

If you are serious, try and save your marriage at all cost, it will have a very bad effect on your daughter. If the difference are beyond repair, see that you get a respectable arrangement agreed with her. Don't try to make conclusion that she is a cheat or anything, try to recover from here. May God give you strength.

Just leave it, this is life. Where r u from ? Which location ?