Why do I feel this way?

Im upset because Ive given so many chances for someone whos broken up with me so many times and didnt do much for our relationship. Hes going out, while Im in my room, getting sadder and listening to sad music to even feel shittier. I dont understand why I feel like this when Ive done so much. And he puts the blame on me. I dont want to be controlled. Im too young to feel trapped.