is love or friendship between boy and girl depends on height?

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i met a girl in one of the marriages and as usually i was friendly to her and also one of my cousin was friendly to her,but my cousin told me he loved her and would love to marry her if she excepted. I just wanted to make fun so i told my cousin i too loved her.and finally we had a word of understading if she loves me he will have to leave her and stay as a friend and the same condition was to both of us. But suddenly every thing changed in one month, she bacame against me as well as my cousin, the entire fault is from my cousin's side but she is blaming me. she is not in touch with me as well as my cousin. i did not understand the twist behind it.