I think he's overreacting but why?

My husband goes to work early and I usually don't go back to sleep. So I will check my facebook and all social media until it's time for me to get ready for work. Well this morning he left or I thought he did, so I get my phone and first thing I do is check my bank account to see how much got deposited because I have direct deposit and today is payday. Well my husband walks in the room (he came back for something he forgot)and sees me on my phone and he blows up, asking me wth I was doing on my phone and I'm trying to explain to him that  I'm just checking my account and he's thinks it's bullshit. Idk why he got so upset, I have never given him a reason to doubt me. I don't even have a life outside of social media lol. Now even though he hasn't given me a reason to doubt him I feel like now he's hiding something. He was trying to hard to blame me for something I am not doing. What do you ladies think?  Is he overreacting or am I? (Mind you that he has never done or acted like this before)