I can’t have sex, HELP

So in June 2018 I had a very bad experience with a guy. I’ll just use the term sexual assault. I like to deal with things on my own and that’s what I did and i never knew it would be this difficult. I am finally at a good point in my life and have been talking to this guy for a while now, and he is so sweet. So I have stayed the night with him a few times and we haven’t had sex. I can tell he kind of wants to but I’m just not ready and I don’t know how to tell him. We have to drive two hours to see each other because of where I am going to college. And I don’t want him to be disappointed or lose interest because I won’t give it up after all this driving we are doing. WHAT SHOULD I DO?? I don’t know if I should tell him, and if I do, how? (Not a typical convo you have over coffee, yah know?) and also if any of you have had to deal with something like this how did you do it? Tips, suggestions, anything?❤️