How do i convince him to slow down a little?

[Rosa]

Im 15 and my bf is 16. Recently hes started to take things to a higher level. Last
weekend i went to his house and he took me to his room and he was touching me alot. He also pulled me toward him and made me sit on top of him facing him and he started making out with me and rubbing hi d*ck on my v*gina while making out (we were wearing clothes though so i didnt mind that) then we were laying down on his bed watching tv he tried to convince me to take my clothes off so we can have sex but i told him no but he was ok with it. Then he started touching me and feeling my boobs and i pushed his hand away and made out with him for a while to satisfy him so he can leave me alone. When he drove me home i stayed in the car with him talking for a while and he asked me why i didnt wanna have sex with him. I told him i wasnt ready yet and i didnt want to before marriage and he told me he was fine with it. Then we made out again in the car before i walked inside my house. I think hes gonna try to do it again another time what should i do??