What is a good spy camera, that I can hide on someone?
Besides asking one of his work mates to place a camera at his desk for you (or if you can, do it your self) there is no affordable way to do that, it is most likely he would notice the camera, and those sorts of cameras come with a camera, and a separate (and much larger) receiver which records all the video. If he goes to work he would have to take the receiver with him to prevent it going out of range, so unless you have a roll of double sided sticky tape and a boyfriend who if dumb enough not to notice a camera receiver sellotaped to his back, I am afraid you are out of luck.