Look i understand whats goin on in your head. I have been like that with my partner for years,and he still has not learned to deal with it all the way,though i am learning to deal with it,and actually get over it. self talk comes in handy alot. giving yourself,fourcing yourself into thinking possitive or reasuring thoughts. "I am ok" I will be ok,even if he is doing...." things like that. look, i am no expert and i sure have not mastered this horrible get wrenching feeling 100% either, but i have gotten help with it and hope this helps you. Are you paranoid over soething that happened in the past? I a because of my ex-boyfrined-and the fears that became reality with him(cheating) was brought to my relationship. If you really want to be with him-let alone anyone until you find out why you are so paraniod and obbsessive,ithink the only way you wont come out as looking like crazy is telling them how you feel,why you think you feel that way,and what you think yo need from them to help you feel better. i think that you knowing it inside as a truth should deffinetly be honest if you plan to persue a relationsip. how long have you known him?