So I've posted on here a little , but this is really my

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So I've posted on here a little , but this is really my first post for advice , so I was dating a girl for about a year , My friends and hers thought we had a awesome relationship but it was getting kinda stagnant we didn't do anything together much and we decided to break up , I heard that about a week or so before we decided to break up she was talking to other guys and I kinda called her a cheat but that was a lie and I get horrible about it and she hated me for about a month or so and we both moved on , but this year we have a few classes together and she started texting me and stuff talking about us being freinds and starting clean , and we started talking but , it's turned into her never starting the convo or continuing it , almost me talking to a brick wall , and I don't know what to do , she ignored my texts for a week and I was like what gives and she texted back in a few seconds ohh sorry I forgot I think she's trying to be passive aggressive but I do value her as a person. /adv what should I do , should I end it and never talk to her agian or just come clean and talk to her about this ? Any help will be appreciated