Hard as it may seem, I suggest you do not broach the topic. Yes, I agree someone does not move 1700 miles to be in a platonic relationship. But, then again, they don't move their mother there first either. This has bizarre written all over it. It is all going to fall apart in the relatively near future. Let it run its course. Stand back and let it happen. Be as uninvolved as you possibly can be.
Time and patience.
H 51, W 46 no kids T 22 years M 17 years ILBNILWY 2/10 1st D talk 6/10 partial recovery W files D 5/11 long distance separation 8/11 moving forward on D 10/11 legal separation complete 1/2012