I'm going to use this guy that claims that wants to be my dom but I'm just gonna use him once and ghost him
Why do you want to have a dom and sub relationship?
I just want to have someone new in my life for a change.
While you're free to have any sort of relationship, you are both consenting so you should honor your side of it. It's terrible to just see him as a thing and use him like that. You need to keep this relationship a little longer with respect so he is happy too.
You don't know anything. I care about him, I'm going to use him as much as I want and then just disappear.
It is wrong to want to use or objectify a person for your own benefit. You wouldn't want someone to treat you that way. If you want something different in your life, you should discuss and be open with that person.