By the way this is also known as stalking. Usually used by women in their favor to accuse some men who show "extra" interest in them. But when its the other way round "its nothing so wrong dear ... you are just fine!" ... whatever!
Not to beat a dead horse, but this gets us to the heart of the matter. In the U.S., we also have stalking laws. If someone is sending unwanted messages this could also be termed stalking in conversation here. I'm not justifying my actions, just telling my story to you, his people, for clarity, instead of once more bringing my questions to him or no one.
But legally, in the U.S., stalking becomes suspicious and in need of being addressed when the person receiving the messages feels threatened or becomes fearful. If they ask someone to stop and the victim cuts off all contact, but the pursuer continues and especially if they become aggressive, then eventually the victim will need to report it to the authorities. The victim fears for their well being.
The very respectful Polish man I met while backpacking is a law professor. He knows legally, in Poland, when my pursuit crosses the line. He has drawn a line in the sand, and I will not just "try" to stop now, I will stop and have stopped.
I do wonder, though, if he sees me as a criminal. In the U.S., I would not be deemed a criminal. There are words to describe what I did, but criminal is certainly not one of them. Where do you draw the line otherwise. I can see the headline: "Man imprisoned for sending roses to love interest." I am asking you, as a representative of this law professor's people, do you think he thinks I am a criminal? Do you think I am, by Polish law, a criminal?
And yes, this Polish man is worth far more than his weight in gold. He did nothing wrong, even while we were together briefly. His girlfriend, or wife, or whoever would be very proud of him.