Here are some possibilities that I have calculated using science.<ul type="a"><li>She is totally in love with you and does not want to acknowledge her existing relationship due to her intensely conflicting emotions.
<li>She's intimidated by your overbearing use of emoticons.
<li>All her friends have boyfriends and she doesn't want to admit that she does not.
<li>She doesn't think it's any of some random guy's business.</ul>