What does it mean when my crush talks to me about his ex in a bad way. Does it mean he likes me?

Okay so there is that one guy he’s my friend. But i kind of feel that i have a crush on him, he teases me all the time and he talks to me about his ex in a bad way and he even told me all the details about his first kiss with her , every single detail, why is he talking to me like this. He even told me once that i reminded him of his ex when i was talking to him. please guys i need your help! Does this mean he likes me?
What does it mean when my crush talks to me about his ex in a bad way. Does it mean he likes me?
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