My life was fine, I decided to nothing...............?

I had the best life here, the best guy from here liked me. I should have been in the rainbows happy, but its just the opposite and much worse. He loved me a lot and I guess he was the only person who genuinely loved me. But my friends are insecure people, and they made me feel insecure, they told their insecurities to me, and told me bad things about him, I think mostly they hallucinated. Anyway he was after me for a long time. During these time he showed me he cared for me. I wish I had only listened to him and not to anyone else who tried to come in between. I don't know what problems my friends had, they tried to interfere in between, maybe because they were jealous he was so good. I know one of my friend she has tried to sabotage many relationships and mine was one of them. She told wrong things about the guy who liked me to my other friends. Anyway I know she has spread stupid rumors about many people, one of my friend's friends bf also she passed rumors about him. And she is so insecure she can't even do a thing without getting scared. Now if someone is so insecure why pass insecurities to others? Anyway because of all this and my friends saying stuff, I never got to respond to him, now he has graduated and moved to another state, been like a month or 2. I miss him and miss his caring nature, he always made me feel safe and I know he loved me a lot. What should I do? Why did I make my life hell? when I know the friends I have are not true friends, yet I listened to them...and did not respond to him. He liked me for 5 yrs, and confessed to me he did not have gf all these yrs because he liked me. Why are some ppl so bent on making other's life insecure when they are themselves insecure? I cannot concentrate on my studies and I miss him. Please help me.