Why it feel so difficult to be his friend?

I have been talking to this guy i met at my sister's wedding from past 6 months. i try my best to be his friend but it's so difficult to be his friend With Difficult to be his friend i meant... he dosen't open up , he is secretive, he dosen't make an effort to talk.. i don't want any romantic relationship with him but he dosen't even give bare minimum

I know i should just leave him to the way he is but was wondering why even a friendship is so Difficult for him

Why it feel so difficult to be his friend?
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