I 100% get that feeling and train of thoughts. Anxiety is hard to control and break away from. Often it has some truth in it based off our own feelings or fears that havent been overcome. In the case of yours with your boyfriend's behavior I have found its better to be focal about it. Dont blame or accuse just let him know what you are thinking and can even mention not sure why if you havent determined why. Normally him explaining his reasoning or lack there of can help. And if he is being really odd about it or gets very agressive about it then you know may not be best person to be with. Being open about your mental struggles with your partner helps a lot to find the right person and someone who can help you overcome it with your own strength. Best of luck and make sure to breathe and remember often times its not something secret or scary in reality.