Am I wrong for having a chat app? ?

I use this chatting app called chitter. My wife and I got into an argument yesterday and I don’t have to many friends or people to talk to when I’m upset so I download this; not to talk about my relationship but just see if I could talk to someone. She try to make up with me this morning looked on my phone and saw the app and freaked out. Now in the past I have downloaded dating apps on one fight and I truly wanted to be done with her. I never use the app to hook up or even get a phone number I open the app and pretty much was done with it in ten minutes it was more of a way just to get my anger out. We been together for six years and I have never cheated very loyal and faithful. She told me never to download dating apps which I agreed but she said don’t download chat apps and I never agreed to that. Now we are married and we have a kid together so she wants a divorce over this. She said she can’t trust me but Within this six years I had a dude send me nudes pics of her.  Which she claims the dude got because of her iCloud. I’m not sure if that’s even possible but none the less it happened. She ain’t never received no nudes of me from any chick. So I feel like if anyone should be worried about someone cheating on anyone it should be me. This happens about two years into the relationship. So  I’m confused should I have not download the chat apps and just say sorry or am I right.