Is it wrong to fantasise about someone

I'm looking for views about whether it is wrong to fantasise about someone. If you can;t have someone whether it be a long distance relationship or whether the same feelings are not reciprocated back. I met someone on a friendship site and cannot stop fantasising about him,he sent me a couple of pictures of himself , his gorgeous, and now I have set in my mind that no one else will match up to him. I know a fair bit about him through exchanging emails, but now that has stopped and all I am left with is a picture of him and information he wrote in his e-mails about himself. he was a really interesting and I thought genuine person, but he has now abruptly stopped communicating with me. Its all a bit strange.

you don't know a person till you meet them, even then so some cases not always fully true.
I used to have my head wrapped around a guy when I was younger, had met him & talked & even hung out, but he left to another state to go look for his ex, I was still wrapped up and I told him about my feelings, he stopped contact totally, I was down until one day I realised I liked another guy who was near & to my surprise he liked me too.... we eventually got together (not to say it wasn't odd but that's a different story) and I have more in common with my boyfriend than the other dude I used to day dream about.
my point is, do you really know this guy your fantasies are about? you may have someone around you that are ''just as good or better'' than this person.

And don't sell yourself short, I mean you don't have to just settle on being heart broke cuz some one you know a ''fair'' amount of doesn't write back.

Also if they completely ignore you that isn't right its hurtful, some could have the common decently to say ''im not interested' rather than ignore & cut ties all of a sudden

Hope you well & hope something helped out of my exposure.