i dont know what to tell him

Well, first, i think he has no reason to feel insulted cuz u dont want him to touch you.
And well, if you are talking about what happend in here, i dont see why not to tell him what happend, i think if he really loves you and wanna be with you, he will understand you and try his best to make you feel better.

yep, U should tell him 'bout it, I think if U did then it will make U feel more comfortable when U around him. & U really should tell someone about what happen 5 years ago.