I had a macaw that would also romance me with regurgitated food. She'd gag/bring it up (I could see the food in her mouth) and then she'd re-swallow it like "nevermind, you're not worth this delicious crop full'. Um, thanks -- really, but I didn't want it anyway.
But my male CAG Snickers is quite the lover and is very generous with regurgitated food sharing. (Is there a gag emoticon in these boards?)
I think the problem/joy of greys is how intensely they feel things. I admit, he does often think I am his girlfriend. As long as he isn't actually suffering/pining/sad with his delusion that I am his his mate -- it's fine. I provide lots of platonic love, good eats, adequate out-of-cage-time and toys. I just have to be careful where I touch him so I don't send a mixed message (which would be unfair to my Snickers -- I want him happy, not pining). I do think it's best to stay close to head/neck/throat to be safe and keep my parrot happy and within normal cross-species relationship boundaries.