My boyfriend thinks I don't trust him?

I absolutely love him and I know he loves me. we have been together for almost 5 months. we have had our ups and downs but things are fantastic. at least they were until a few days ago. you see my last relationship was something of a nightmare i wouldn't even wish on my worst enemy and because of that i sometimes get paranoid that he will do the same thing to me. i'm human, i get scared sometimes. anyway, i felt i could tell him what was on my mind and when i did, he took it as that i didn't trust him. telling me we don't have to be together if that's how i feel. by the way, every time we have a disagreement or something, he is so quick to jump to a break up and i don't know why. so since that conversation, hes been acting really distant. i have apologized repeatedly but it doesn't seem to get through to him. i realize it was unfair for me to judge him based on my past but i really don't know what to do now. i don't want something like this to come between us and ruin a great relationship. any advice plz