How do I leave a toxic relationship?

You tell them straight up what they've done wrong and see if they can do anything to rectify it. Be careful of empty promises, they are tricky and hard to tell apart from genuine promises. Give it some time and you will certainly find your answer. After that, it's leaving and never looking back. Maybe you'll be able to reconnect as friends but it's harder with a relationship, especially if that person continues to become toxic and ungovernable. Leaving a toxic relationship can be a really tough challenge, especially if you still have emotions for that person but if you stay, it will continue to fester and hurt you. The best thing sometimes is to let someone go.