Broken

So I just ended my relationship tonight. It was a toxic relationship. He never wanted to fully choose me and always put me last in his life. He's made me feel terrible about myself because of never choosing me. we've been off and on for a while cause he keeps leaving me and then coming back. But we've been together for three years and I do love him with my whole heart. But I decided I needed to love me more. Which meant letting go of him. And I am completely broken. He's been my person and when he's not in my life I feel so empty and broken but I also sometimes feel the same way when he is in my life. Has anyone gone through this? What did you do? How did you help your heart heal? I'm so sad.