The 'overbearing' boy not so next door

"fan mail" sent to me from a Tumblr user.
*picture and (some of the) username
cut out for privacy

Most girls can remember back in yester-year when you would watch the movies where the girl was with the "wrong guy" and her best friend/admirer finally gets her to break up with her beau and they fall happily in love once she realizes he's the one. Oh, be still my heart! How I yearned for such a beautiful love.
Now that I've grown up and noticed the kinks in those romances..yeah, not so much. From young girls, we were force fed the idea that women should be chased. (not down a dark alley, but that's a whole other post) But when does the innocent flirting begin to go overboard?
As an active user of Tumblr, I do receive a message here and there, sometime's it from lovely people who are pushing me forward, telling me Good luck and God speed! Sometime's it from not so lovely people who aren't so positive, but most of the time... It's from this gentleman. I'm not trying to say in any way that he's a bad person, the conversations I've had with him were very polite. But he knows I'm in a relationship, in fact I've talked about Rocky in multiple conversations, and yet I still receive messages like these.
 I can't exactly put into words how these messages make me feel. Wait, yes I can...UNCOMFORTABLE! It feels as if they're getting progressively...I don't want to say harsher but I'm drawing a blank with my inner thesaurus/dictionary. It's escalated from talking about each others blog and snow and now it's messages like the one's above. I mean, come on, he lives on the other side of the country and now he's wasting his wishes for me to move in next door like in a 90's film.  
Do you have any idea how I can make this stop without being rude?