Do guys form long term fwb relationships?

[Kara]

I have known this guy for a year now o facebook. He was single and he's the player type and that was okay with me because I am not looking for any relationship and he's just looking to jerk it off (sorry for the blunt language). We had a spoken contract that I would help him and he would give me the flexibility to explore sex with him. I told him that I agreed but I would not be labeled a friend with benefit because I don't want it to seem like a relationship of any sort and that we could just be weird friends instead since I did not want to be entitled to him.
It worked out great! It ran smoothly for 9 months, online sex chatting once a week, talking on the phone, he would occasionally ask for me to meet him to do it in real but I would deny and it was okay. Things changed when he got a girl friend.
I told him that we had to stop it. He did not take it too well. He kept calling me from different phones until I answered and he told me he "needed" me. I told him that I could not do it because I respect him too much but a few days after he called and said he needed it one last time and he would leave me alone until we are both single so I agreed.
That was not the end, he continuously called a few days after and messaged me and kept asking. I told him that it is not right but then he said that he and his gf are together but she gave him a free pass so he wants to use it. Well now he keeps messaging and calling me during school time and it has become annoying even though I told him to STOP!
I am on the verge of deactivating my fb account because I think it is very scary... his behavior does not seem normal. Can someone clarify for me, is this normal for guys to react in this way? He should know when to stop because it is becoming really scary :/

[Elsewhere]

No, it's not normal for a guy to harass you like this. Cut off all contact with him for good. Eventually he will give up and leave you alone. Since you have no connection to him in real life, it shouldn't take long. I think that was the problem, the distance makes it easy for him to forget that you are a person and not his personal sex toy.