Why does he act like that with me? Please help

Ok well I am confused on this guy he says he cares for my well being and stuff but then his actings tells me other wise like he acts like I don't exist and ignors me. But why? Also when he is alone with me he is different like I exist but then when is friends come by or are near he acts like I don't exist. But he knows I like him but he wonders why I like him. But he told me that he doesn't like anyone on this planet. So then why did he ask me to tell him why I love him or like him? I try to tell him but he has bad timing when asking that question. So 2 weeks ago he told me to write a letter down about how I feel. Which I did and now he is acting like I still don't exist why? Like I want to know what he thinks but why does he act like that with me? What should I do? also I am confused cause he is giving mixed singles .
Updates:
+1 y
Not mixed singles I meant mixed signals.
Why does he act like that with me? Please help
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