I think it's good that you are getting away for a while. You need some time to yourself and I don't blame you in not wanting one of his relatives to stay with you. You are a very strong and independent woman who doesn't need a babysitter. Having someone w/you would alleviate some of his concerns for what he is about to do.
I would venture to say that he's going to feel a number of emotions once you've discussed the contact issue with him. Sure, he's going to feel some relief that he will be able to concentrate on the marriage preparations, but he's also going to be wondering what you are doing and even may feel some panic that he's not going to be in touch with you like he has been. They tend to want to know that we are right where they left us and it's difficult for them to accept that we can make decisions and continue living our lives no matter what they are doing. I think he'll be very happy to have you home again and be able to talk to you and discuss things with you.
Our culture is so different and I am curious to see how your situation will play out once the other woman becomes his bride. He's going to have a different set of rules which is the 50/50 equality of time spent w/each wife. How do you think he'll be able to handle the stress of not having complete control once the marriage takes place?
I hope you are doing well and I wish you safe travels in the days ahead.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.