I have a crush but he talks about my ex?

For some months now I have a huge crush on a guy. I meet him regularly. He was slightly shy at first but now he talks a lot. He knows my ex. Since the past two weeks, he kept talking about my ex. This is really annoying. He probably knows I like him and he seems to like me too so why would he talk about my ex please? Thanks

I have a crush but he talks about my ex?
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