Is donny osmond gay

Since Donny's not gay, can someone explain to me the gay pride flag he showed AND the mention of his "partner" in last week's episode? The "partner" comment is really throwing me off.

After one of his dance numbers, Donny “toyed” with the openly gay judge Bruno Tonioli and kissed him in a daring move. Given his background, Donny probably realized that it was a rather controversial move.