How can I control myself around him?

You have a few options here, depending on your will power and self control, you can just tell yourself that you know you want to remain a virgin and things should go smooth. If this is not the case then if you feel you are about to give in then give him an excuse on why you have to leave and get out of there, and if your in a bad moment to do that like if your watching a movie or something, then say you have to go to the bathroom or something just to avoid seeing him for a minute. If that does not sound good, then just try to get into the public, like say "Hey let's go on a walk" or something along the lines of that, it should turn you off real fast by being in the public.

If this is all sounding bad then when you plan to see him, then have a friend or multiple friends with you, not only will this cut any reason that you would want to have sex, your friend would be there just to stop you if anything is getting too far, just let them know that you want them to stop anything past making out.

Hope I helped,

--Wraith

PS: I am always here to help just add me to friends if you need more advice.