How do you cope with a partner that roamed your phone without your knowledge?

Me

My patrner roamed my phone for almost 4months before telling me about it. I was shocked when he told me how his phone recorded all my conversations, text messages, WhatsApp messages, Facebook, messengers etc. I feel I am in a toxic relationship, I am emotionally unstable at the moment and I feel I should take a walk. Am I overreacting?