What is an emotionally unavailable man?

Brittanyroseee
I recently started talking to my ex again over a month ago. I have made posts about him in the past. We started hangingout in 2019 when he was in sober living then he went to prison for 16 months in 2020 and got out June 2021. When he got out, he basically switched up on me and got back into drugs and has dated/hooked up with several women who all messaged me how he is a narcissist, etc. He has been on/off using methamphetamines and is just a mess. He has a job and his own apartment so he is a functional addict, but the people he surrounds himself with are not the best. We hungout the other night, and he was just all over the place rambling. He told me he is emotionally unavailable, has no feelings and is a hurt person. He has been like this since i honestly met him. He told me he prefers to be alone and doesn’t want a relationship. But why does he date girls and hops from one to another?
What is an emotionally unavailable man?
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