How to Leave a Marriage That You Were Unhappy In

I want to commend you for having the strength to leave a marriage that you were unhappy in. In my case, it felt like a public failure. Do you feel guilty that you're happy? Maybe. Even though I feel secure in my relationship, those days where you just feel the sense of grief and who was I before this relationship? You give so much of yourself that you forget to take care of yourself. And now, you're just me and my cat.