Guys, do you ever reminisce over old flames?

I dated a guy for about a year, but we had to part ways because we no longer live in the same country. I know now that he is not the best fit for me and understand why we didn't work out, but despite this I can't shake the memories of how great our chemistry was. So I guess my question is if guys also think of past girlfriends with whom they had great chemistry with? (I would never reach out and ask him, but wanted to know if there might be a possibility that he was still thinking of me as well.)
Guys, do you ever reminisce over old flames?
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