Much much better to be straightforward now, and risk things falling apart before you move there permanently, versus letting misunderstandings fester to the point that it explodes when you're already moved in. It'll be kinder to everyone, by far, to be clear now. If he can't handle it, well, he won't handle it any worse now than he will down the line.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.