Could I have been cursed?

If the girl had enough bad intentions towards you then she could curse you but there are also psychological reasons for this going on you could be thinking about it so much that you are scaring yourself into thinking that you are cursed but there are ways to reverse curses i would suggest a "reverse a curse/hex spell" it is quite effective i've used one for myself and it worked quite well. It is absolutely possible that you could have been cursed if the girl harbors enough bad intentions toward you to do such a thing as a curse. and not believing in curses like the others have said in their comments will remove the fact that it is still there i would suggest a cleansing with sage after your do the reverse a hex spell as well just to get rid of any left over energy that may linger

curses/hexes get more powerful when you worry about them [incidentally i know i'm gonna be cursed soon by a witch who loves to curse people and i upset her] so this is what i'm doing, first, protection, meditate and strengthen your 'psychic shield' [not sure what you'd call it, but everyone has a barrier to protect you through the day. think about a white/gold light surrounding you] then a defense spell, and a luck spell [in case] finally, don't think about it. however, if i notice i might be cursed, a hex breaking spell. mostly, defense and don't think about it, you'll fuel it.