Wife has extramarital affair

Hi, I got married 4 months ago, but my marriage has been fixed 2years ago with my wife. I am 28 years old and wife is 20years old. In beginning of fixing my marriage it was all good but after few months letter I got a job in Dubai and I settel down there. After that I have seen a lot of changes in my wife behavior before marriage, she was always ignoring but still I have done the marriage. During my honeymoon I have noticed my wife is not happy and I keep asking her. But she could not tell me anything. Again I came back to Dubai as I went for a my wedding leave only. Then after 2mnths I realized that I should give a time to her as well as my wife went for an exam to her home town again she was same not showing any care and all, so I decided to go back again as an emergency leave for 15days, and I called back again to my home. The day I came from Dubai, she was not happy at all so I was talking to my friend about her behavior,so my friend has advised me to check her phone, in fact my parents can see her weird behavior towards me and parents. So I have checked her phone but I couldn't find anything but after 1weak I find her chatting on social sites with her boyfriend, as well as 5to 6 male friend of her.... I got shocked chat was not normal she was sending her pics on daily basis to her boyfriend on his request. So many annoying chats I got during that time. When I asked her she was hidding everything but I have login her fb account on my phone and as well as I changed the password. I have seen she was flirting to so many of her male friend.... At least she has confess she has so many affairs and still she is in relationship with her ex. As I have decided I can't stay with her. So I need advice when I can apply for a divorce, as now again I came back to Dubai for my work and she is in her home town.