Help please

Is he cheating on me 😢 First it started with no morning texts for a few days, then stopped tagging me in things he’d have usually tagged me in, then the texts through the day stopped or became far less and then after sex he just jumped out of bed, couldn’t wait to get up. When someone’s behaviour changes, it stands out and there is always a reason for it. I’ve been cheated on before I know the signs. He’s not as affectionate as he used to be either, accused me of being off with him when we were out the other night, and of messaging other men... 😢