Do you think he's cheating?

My baby daddy left me this morning. Grabbed all his shit and left. We fought in a really ugly manner & alot of fucked up things were said. I'm currently 5 months pregnant, I FEEL everything. I could be wrong but after today I feel in my heart I'm right. We fought over his phone. I've been telling him I feel him changing and acting different. He says I demand too much simply cus I ask him to balance the time with his kids & myself. He'll spend 30mins in the morning with me before falling asleep because he works graveyard shift but he sees his children daily 3-4 hours everyday. Mind you, he has to go see them at his babymommas house because she doesn't like me & doesn't want me being around her kids. I've never done anything to them. I dont mind the time he spends with them but asking for 30mins or an hour of his day is too demanding from my part. Asking him to text me back throughout the day (when hes awake) is me trying to control him in his eyes. We dont even have the same days off. Explain to me how I'm asking for too much or how I'm hating on his children? Because of all of this and more I asked him today for his phone, I've never asked him for it before. He told me No (he has my password but I dont). I asked him why and if that was the case I didnt need further answers on why I thought he was cheating in the first place. He kept saying it was his privacy and that he wasnt doing anything wrong at all. Ok, so then why not just show me the fucking phone for 5mins just to reassures your partner? Still said no. I flat out asked him to choose between his phone and leaving. He replied with, I'd rather leave then give you my phone. The rest was just a blur because I lost it. Please tell me I'm not the only woman who would believe the worst from their partner in my situation?