My friends boyfriend (fiancee) has recently been very busy with work. She often asks him about business meeting he has throughout the day as his business requires him to meet with various clients and often at their homes. Lately he's been getting irritated by questions saying that he shouldn't have to explain every move he needs to do and tell her about everything. She finds it weird and is suspicious. I feel that he is simply stressed out and there is really no reason to suspect something is going on. What do you think?