Is it harmful for my blue parrotlett, Goliath, to be "in love" with one of my atiels?

Goliath is the only parrotlett in our flock of 7 atiels. With 3 males and 4 females, my little Goliath has picked the un-attached female as his. I let them all out together, most of the time, and Goliath has been wooing little Rupertina, for about a year, now. He always sits beside her, and will run off any male that comes too close to her. He tries to get her to preen him, but she just ignors him. She seems to have warmed up to him in the last couple of months, at least she will choose to sit beside him instead of trying to move away from him. She likes his cage, too. She will go to it and sit there and eat from there, as well. We keep a close eye on all of the birds when they are out, and we have never seen any aggression from any of the birds. Goliath, just chases the males away from Rupertina, he has never attacked any bird. Is this relationship something I should be worried about?