Ex messaged me and called me 'sweetheart'. How much should I read into this?

Anonymous
I haven't spoken to my ex for a long time, and then last night he messaged me and called me 'sweetheart'. It was just a simple message asking how I was. I know I'm probably jumping to conclusions about this, but what do you think?
Ex messaged me and called me 'sweetheart'. How much should I read into this?
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