Do you think I'm being haunted by a ghost of someone I didn't even know?

Some time back, someone that I liked, but WASN'T really close to, ped away. I hardly doubt he even knew that I liked him and I was convinced so myself only after he ped away. And his death came as quite a shock and I couldn’t sleep at night, I would just sigh and weep and wail. Then after some time, I started dreaming about him. And I started dreaming about him only after he ped away. And every time I have a dream about him, I would normally get to know something related to him, or something about him that I didn’t know before the day after I have the dream. The last dream I had of him was on the day he was buried that year. But of course I figured out the connection only several days after I had the dream. And in that, he specifically said these words, “Mated together...” and I said, “forever and ever...” which sounds quite corny, if you ask me, and I’m frankly not the type of person who goes around telling people these kind of stuff. And then in that dream, I started talking to a ghost using a pendulum – turning clockwise for a yes and swinging for I don’t know. I asked the ghost if the man I knew (who happened to be there in front of me when I spoke to ghost in my dream) was dead, and the ghost said yes. The funny thing is, that I knew in my dream that I was dreaming and knew that the man was dead. So I told the ghost that the man is right there now. And then the ghost started pulling my hair. That was it for the dream. Later I found this site http://www.scribd.com/doc/448202/How-to-Tell-if-There-is-a-Ghost-in-Your-House-Very-Easy-and-Cool-Try-It which presented a similar way to talk to a ghost. So I did it and was able to talk to that man. He answered all questions regarding his life correctly but I wasn’t sure if it was my subconscious mind playing tricks and my hand twitching. So I gave it up after 6 days. Ever since then, when I get up in the morning, I see unexplainable bruises in my body. And I wake up in the middle of the night with my whole body aching. Can someone please tell me if that man’s ghost really is inside my house? But I can ure you that I didn’t know him that well at all. It was just one of those crushes, I think. I mean, I haven’t even dated another guy (pathetic for being 18) because I don’t know, for some reason I was never interested. Help please.