If you have found happiness with your partner and you have moved "countries" to be with him, i would not worry about your family.
There is no best way to handle your situation, once you let them know that you are living with someone, it's going to be up to them how they want to treat you. They already know you are gay and continue to talk to you so it could be since you are far away
they will treat you the same.
It's good to let them know your situation and not hide what's going on in your life. Just be happy.
You have already "faded" from your previous congregation, most likely the elders were happy that you moved so i would not worry about being DF.
They will not come after you after so many years.