My best guy friend said he is afraid of losing me!

we are friends for almost 10 months now, and yesterday he was saying that he is afraid that someday he will lose me.. so I asked him if he means to be more than friend, like boyfriend/girlfriend and he said no! but he wants to be sure if he wanted to think about his future he will be able to count on me!

what does that suppose to mean? like before in being in serious relationship, he was talking about marriage? what he meant as LOSING me?!
My best guy friend said he is afraid of losing me!
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