Is this cheating?

My husband suddenly changes his hairstyle, after he started working at a new job. Its odd for him to want to look nice, unless we have special occasions. But for some reason, he began changing his hairstyle. He used to never style it, now hes keeping it long, and using gel to put it on the side. Back then, i used to always suggest him to keep it long, he refuses all the time cause he says he likes it shorter. For some reason, he begans liking it long? And even his diet, he doesnt eat as much anymore like how he used to. Only 5 spoons and that it, cause he says his stomach is getting big, so he needs to eat only a little, and skip meals. He only eats 1-2x a day, when he used to stuff himself whenever i cook. Could he be doing all of this for a woman hes into? Ive read online and it says things like this are signs of cheating. He doesnt call me anymore during his breaks when he used to all the time. He stop a few days after working at this new place. He loves going to work and i notice that he would sleep a lot the day before work to make time go by fast for the next day to come.