Dude avoids me for no reason?

So this dude avoids eye contact with me when we talk, tries not to be on the same team with me when we play sports , won't sit with Me, I literally asked him for a car ride today and he lied to reject me. I have no history with him, only connection is that he is good friend with my ex. Could it be bc my ex talks shit about me?
Dude avoids me for no reason?
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