Is this love or an obsession?

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Good day to all mylotters. I just want to start this topic because it is bothering me so much.I hope you can give me a help on this one. There is this guy who always send me messages on my email and on my phone. He keeps on insisting his feelings for me even though I already told him for so many times that I do not love him. We were good friends before. He courted my friend for a week and after that, he stop. Whatever the reason, we don't know. He spend more time with me rather than his peers.Although, I am not asking him to go with me whenever I have to go to a certain place, he volunteers himself. I can say that he is kind and very thoughtful those times. But despite all the good things he is showing to me, I not fall in love with him. And whenever there is someone who will courts me, he will show his bad temper and will get upset with me. He told me what he feels and I honestly replied that I cannot love him back. He is courting me for more than two years now and is still not giving up. I don't know what to say. He always disturb me on what I am doing. He always call on phone and he just ignore me everytime I will respond "please don't disturb,I am at work." He is so insensitive and I admit that sometimes I feel somehow scared with him. He keeps on telling me that he is going to be crazy because of me and that he really loves me. Do you think, he really feels love? Or do you think, it is an obsession already? I am having this mix emotions for him. I want to pity him, and get angry and get scared sometimes.What will you do if you were in my place?