Husband involved in extra marital affair what can I do?

I got married in 1993, had a child in 1994. I took care of the family and worked too, in Dubai.In the year 2011 I left Dubai due to my son's studies.My son and me were staying in Chennai. In the year 2014, my husband approached VLCC, dubai for a weightloss program. There he met with a lady dietician. From that time till now, these 2 are having an extramarital affair. She is also a married lady. My husband and she are staying in 2 different houses in dubai but nights they spend with each other as and when time permits. My husband has owned up to me and has told me clearly that he wants me to stay separately in India. She also has the same arrangement for her husband and her daughter, both of them are in Kerala, but she is alone in Dubai. I dont know what to do.From the past one month he is not contacting me at all. All this while, only when i call he used to speak to me. Now i decided, when he doesnt want me then why should i talk to him. Please tell me what to do??