I have been told that my ex misses me after 3 months and has regretted to dump me?

My ex and I broke up 3 months ago and no talk to each other ever since. We passed each other at parties and yesterday he has told my mate that he regretted dumping me due to one member of his family has died recently.
I moved on already, until last night what I have been told that he misses me and I don't know if we should talk about it? Been told that my ex and I should talk.

I don't know what to do.
I have been told that my ex misses me after 3 months and has regretted to dump me?
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