Who is causing the problem? Me or Her?

Me and this girl are friends, or at least we were fairly friendly up until the beginning of April this year. Our time tables don't really match up, I work days and she works nights, I have the weekends off but she usually reserves that for her boy friend. Well that does not bother me, but what does is the fact that she assumed I was glarring at her a few weeks back and still has not let it go. I was playing football, and I saw her in the distance, with her current boy friend and I kept playing, she said hi to my father and left the game (she stopped by because her father was the coach of the team we were playing). The next day I was gone for a run, turn the corner and blow by her and her boy friend again, I didn't see them, she texted me latter saying "you know regular people tend to say hello to people they know". I told her what happened and she said I was lieing and avoiding the true reason behind me not saying hi to her (her current boy friend). At one point I did like her. So then a week goes by, I had been fairly busy I try talking to her but she bairly talked to me until i was leaving, she said "FYI ... if you want to be my friend ... try harder". I asked her what was bugging her and she said "Well the fact you glared at me at the football game, and the fact you are lieing why you didn't say hi". I told her I had been busy and kinda down (I have had issues sleeping and been depressed). Well the next time I saw her I didn't know what to do, I have become a bit frustrated with this and well after a few mins I walked over and said hi, she brought up me glarring at her at the football game again and I kinda don't get why she won't let this go, its been a few weeks. What can I do to improve this situation?? Or is it just me?