What does it mean if an ex brings up old memories/jokes?

Anonymous
Me and my ex were together for 3 years and he brokeup with me almost 6 months ago due to distance. We've recently got back into contact about a month ago after 2 months of not talking. He first contacted me out of the blue trying to seem friendly and interested in what I've been up to. He even brought up old memories/jokes we used to share like "Remember when..." and "Speaking of... that reminds me of..." we only talk at least once or twice a week as of right now. But im not sure if he's just trying to get us on good terms or maybe there's something more?
What does it mean if an ex brings up old memories/jokes?
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