How do you know if someone is stalking you?

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Few weeks ago, I enrolled in an English class at Makati. Since I am not familiar with the place, I always take the taxi to go to the training center. But just last week, I thought of commuting through bus and jeepney. Since that was my first time, I ask the guy beside me in the jeepney regarding location and he answered nicely. When he said that I am already in my destination, I get off the jeepney. But when I was walking going to the exact location of the training center, I heard someone calling "Miss!". Before I could turn around, the guy in the jeepney was already on my side. He said that he just want to ask something. I said automatically that "Sorry, but I don't know any place here. That is why I asked you later." But he said it has nothing to do with the place, because he lives nearby. I stopped for a while since it was already clear in my mind what he is up to. And all the while, I thought he was going to the same direction as mine. But I was wrong, he get off the jeepney to follow me. At first, I am not that afraid of him but when he started asking question which are I believe were personal I began to feel uncomfortable while we walk. And before I realized, I already gave him my full name and mobile no. It happened so fast, I felt like something is going to happen if I did not gave those information to him. I thought of giving the wrong information but then again but was not able to have the courage to do that. After that, he called me and texted so many times. The way he talks, I can't deny that there is something wrong with this man. So this morning, I took a taxi again and not jeepney because I am afraid that the guy might show up again in the place. And I arrived at the building safe and attended my class. After my class, I left the building to go home but I was just about a few walks away when I crossed path with this guy which I did not recognized. Then he called me. I was so shocked to see him. I can't really find the words to say when he said he was calling me and started explaining why he was there etc. I was so afraid. This guy started asking so many things about me. And again, I happen to give more details about myself.. When I realized that things are not getting worst, I decided to keep my mouth shut. He asked me for lunch but I said I have to something to do that afternoon. He asked so many question from facebook to my personal life. When I said I do not have facebook account, he did not believe me and still pushing me to give it to him. Then finally, I said that it was only intended for my family and close friends. Then he stopped. But after a while, he said that he feels like he was the only one excited about us meeting each other again. I don't know what my reactions were that time. I really thought this guy is crazy. He asked if I already have a bf, I said yes and he asked how long has it been and so I answered. Then I saw him being so disappointed and I got really nervous again. I thought it was the right time to say goodbye to him but when I said it, he raised his voice then stopped. I thought that would end the conversation but he started showing me his identification card, showing his full name, where he works, what he does etc. I finally decided not to talk anymore. After a while, he said that he also have a gf and started to defend his actions. He said that he thinks that there is nothing wrong if he wants to make friend with me. And asked if my bf is the jealous type. So many questions. But I did not answer anymore. So finally, he let me go freely. When i checked my mobile phone, I have 18 missed calls. All came from that guy. I am afraid that next Saturday he would appear again in that place. I haven't told my bf about it yet and I bet he would be very worried about me.. but I am sure he will get mad that I am so careless to give my personal information to a stranger. What do you think of this guy? Is he stalking me?