Can i get hiv from a guy who was not sexually active before by having unprotected intercourse with him?

If he is HIV positive, yes. HIV can be spread by other means, please read below. Proper use of contraceptives can prevent transmission of HIV and other STDs. https://www.cdc.gov/hiv/basics/transmission.html

There are, unfortunately other ways of contracting HIV, a relatively common one being through contaminated needles. If in doubt, talk to your doc about getting tested.