text: It seems that this guy loves you alot, more than anything like you are the most important person to the world, He would say you are the girl of his dreams, the one he would want to marry you, sometimes to a guy when he hooks up with a woman he feels more positive about himself and his life love has that kind of affect on relationships, i would say the reason is because he is blinded in love for you make him feel great, and he doesnt want to loose that feeling, and he probbalys is insecure of himself thinking that if he lost you, his postivenes the greatness of love that he is recieving from you will be destroyed so his ego is raised up to a solution which is to doubt you on ur relationship with him. when he ask you that he is answering his greatest fear it is reassuring him, you should try to get him to realize that your love for him is never ending for him and that you feel the same way for him, dont let his insecurity of his feeling in the relationship get you down  instead help him reassure himself in other ways by finding other activitys to help him get reassured of the love and positivness in both of your lifes and continue and i bet you that he will stop accusing you more remember it is his insecurity that he does it find a way to make him secure in that area and your problem will be solved.