I need a girls point of view?

ok i asked this girl out last February and she said no, NOW after a year i texted her because my friend was busy and wanted me to text her for him, so i did and after her response she said ''now bye'' and it offended me because i never did anything to upset her all i did was be polite and like a friend, than i text her agin and asked if she had a problem with me, she said yes and i asked her why and she didnt say so girls wht would your problem be?