How do you know if he just wants sex?

Hi guys.
So I met a guy about a month ago. We seem to have hit it off, we connect well, and we are both attracted to each other. Today , he told me he can tell I’m the one for him. I asked him how could he tell so soon and he said he just feels it and he can’t wait to express his love. I asked him how does he plan to do that and he said he wants to make me happy, give me the best times of my life and also sex. When he bought up sex, I felt he just wants to use me for sex.
For reference, I’m 21 and he’s 20. How do i know if he really wants a relationship with me or just sex? He knows I’m a virgin so I’m scared of being used.
Thanks guys.