Who to pick

My job requires to communicate with people on the internet. This is where I met my ex. She was always very cool and we became friends. Then once we met personally as friends and next day we drank and we ended up in the bed. None of us planned this way but it happened. Then we kept on seeing each other. She wanted me to move in with her that I did after a couple of months. A couple of days later we got into a big argument. I told her that she deserves to beaten by her ex husband because she was really yelling at me. Then she looked at me very scary and run away and she took the key with her. I got so scared that I packed up my stuff and ran home, I figured how to escape. She came home not much later but I wasn't there anymore. After we still met and had relationship, I felt myself like in paradise when she surprised me with so many nice things on my birthday. She wanted me to move back to her. But the day when she took the keys, this other woman, also from work who is from Japan after I told her what happened with me told me so many nice words that I decided to have a relationship with her too. My ex wanted to spend her birthday with me that we did but after sex she said she loves me and wants to be with me, so at that day I showed her my text messages with this Japanese woman that was full with hearts and I told her that I don't want to see her anymore. I blocked her from everywhere. Not much later I flew to Japan and a few weeks later I married her. I didn't hear too much from my ex for a couple of months but after for a year she tried to contact me saying that she loves me and couldn't forget me. I ignored her. After I thought we can talk. And since then we are talking every day. This is how it's been for a year. She says she loves me and regrets what she did and went to therapy to be sure that won't happen anymore. She tells me so many wonderful things and very romantic. But I don't want to go back to my country anymore and I'm not sure if it would work with her. I love to live in Japan. She tells me that my wife for sure doesn't love me because she didn't give me proper heating in my room, I don't have a closet for my clothes and she's not sharing hers, only I clean the house and cook, when I had a problem she told me it will be everything ok and we can just talk about it later, when I had a doctors appointment she cancelled it because the there was a little rain, I have to hire somebody else to teach me the language when she's a Japanese teacher and she helps me with my future because she helped me to find a pension fund that I can pay for but my ex says she will take minimum half of it when we divorce and she can use this as tax deduction and she will get pension from this too but it's on my name! I don't think anything is wrong with these as we have a good relationship so why I wouldn't help. I go with my wife to some programs that she likes and she is prefer taking rest while I go to programs that I like. I feel myself really good in Japan, I don't want to live anymore in my country. Here I have friends from my country and I still have the same online job as I had before. My wife leaves me alone in my room where I sleep but my ex came in to talk all the times and wanted to sleep near me. My ex says she would live with me anywhere in the world but I like it here. It's such a hard decision. I know I hurted my ex but I have a new life now and I think my future is better here because people make more money.