What does the definition of spark mean to men!!!!

Well here's the story. I have been with my boyfriend for two months we just broke up. He is going to the marines and about 2weeks now he has been pushing me away and he admitted when I had confronted him that I wasn't his type I didn't have that spark but with type he meant personality. I didn't understand because not to long he said he was scared to loose me and that I was everything he has wanted in a girl. He wanted me to give him a hard time, I'm not a bitchy person when it comes to being in a relationship and eventually in time I would of but I didn't feel the need I needed to. I just don't understand at all what he means by that. I'm sad and hurt. Can someone explain to me what this all means!
What does the definition of spark mean to men!!!!
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