My boyfriend said he couldn’t leave me?

I am in a 3 years of a relationship with my boyfriend. We had ups and downs. But recently he broke up with me and he started to talking to another girl. We were living together. After knowing that when I tried to leave he said he can’t leave me. He even stopped talking to that girl and he is being nice to me. But I can’t forget that and I am having a really hard time to make a decision. Should i just stay with him or leave him?

My boyfriend said he couldn’t leave me?
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