I am engaged but still attracted to an old crush? what should I do?

We knew each other and we were talking before I met my fiancé. I stopped talking to him when I got in a relationship and he didn't reach out either. I didn't really think about him much but then I found his phone number in an old notebook and texted him. He replied right away and we started talking again. I told him I am engaged now but that doesn't stop him from being very flirty sometimes and I like it. I love my man and our relationship is great but I feel like I still have a crush on my friend too.

I am engaged but still attracted to an old crush? what should I do?
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