How would you feel?

How would you feel about your SO telling you they never used twitter, and then finding out they created a private/anonymous twitter account to follow porn/hentai accounts.

More context:

He said he used to have tumblr instead but they banned porn.

Edit:

I brought it up to him and he said “is it wrong of me to not want you to find my porn stash? Can I not have on secret??”

And also, “you really expect me to be like oh yeah babe I made another porn twitter.”

He got very irritated with me. I apologized and realized that he deserves his privacy, especially when it comes to things like that. What he does on his phone and social media is his business. I apologized for being nosy.