Why would he ask me if I am free at night for chatting and then he does not chat and pretends like he never said that?

this guy is not my boyfriend. we are online friends. and we have been talking for four months. and he talks dirty to me sometimes. few days ago he asked me to chat at night i said okay and when i texted him he pretedend like he never said that. he has done this three times. it hurts me because i wait with hope that he is going to spend time with me but he then ghosts me. what could be reason of it?

Why would he ask me if I am free at night for chatting and then he does not chat and pretends like he never said that?
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