When a guy says, "yeah sure." what do you mean?

Ayourwelcome
so, i finally get to see my good guy friend.. its been ages. But he seems like he wants me than he doesn't want me. Him and his girlfriend recently just ended things so lately his been hitting me up more than just a friend… But lately he keeps acting like he lost all interested… he tends to lie and than admitting that he lies than i go back to him after he says "sorry…" input from guy or girl would help before Monday.
When a guy says, "yeah sure." what do you mean?
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