how can i know that i am really fall in love w/ guy?

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have someone that I've chatting sometimes 4 or 6x a week and leaving a one or two letters everyday of each other, were getting spend time (4 - 6 hour)of each other, sharing, talking about my life and his life, about our families, and also our planning to meeting in person, to get marry and to build our own family,and but there have time that he cant leave me a message and he told me that he always busy in his work,and i understand of that, so that sometimes he can't spend the time for me, and some times when i text him he cant reply any of my messages, i getting confuse if he still interest me, some times i getting guilty if i cant see, and sometimes i getting jealous if i heard the name of girl when we chatting even he told me that only a friend, and i not getting queasy because he is far w/ me, I'm getting unexplained w/ my feelings. i don't know why i getting hurt, worry when he cant online and not to talk w/ me, even my prediction said that the is not my destiny. what you see for me? i getting in love for him or i getting concern or it is a puppy love? i really like him so much... and also please let me know that what difference of love and true love and how can i get true love?