[ItalianFX]

Preflop: Raise to 1000.

Flop: I'd probably fold here. This could be either him probing to see if you have a big hand (where you would raise) or overcards, where you call down. In this case, I think he is pretty sure he knows what you have (unless he's not even paying attention). Another possibility is that he is milking you, which I don't think is the case. I think the odds are way too good though. He could also be betting a flushdraw here in hopes that he hits on the turn or river, like a blocking bet.

Turn: I think a push could be argued here. Donk hasn't been showing any strength, but I'd still be careful. Odds are huge, so I call again with the overcards and the nutflushdraw.

River: Good card, getting too good of odds to fold no matter how much you think you are beat because the Donk is playing dumb. I call here too.