For the past two weeks my coworker have been ignoring me and wouldn’t say hello unlike before he would say it everyday why is he acting like that?

He’s been ignoring me for the past two weeks and when he talked to me he wouldn’t look me in the eye we used to work and talk together almost everyday and now i feel he’s just been ignoring me he would talk and joke with everyone who’s office is around me but still ignore me I don’t know why he’s acting like that i’m sure that i never hurt his feelings or wronged him but why is he acting like that it’s making me upset?
For the past two weeks my coworker have been ignoring me and wouldn’t say hello unlike before he would say it everyday why is he acting like that?
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