What are some obvious signs that an ex boyfriend misses the girl and wants her back?

I still love my ex boyfriend very much, and I know he loved me while we were together (pretty sure he still loves me). The break up wasn't bad, and we were both incredibly sad and miserable when it happened. I haven't been contacting him, but recently he's started contacting me a little bit. Guys, what are some signs I should look for to know if he still loves me and wants me back? If you've ever been in a situation where you wanted your ex back, how did you act or make your intentions known?
What are some obvious signs that an ex boyfriend misses the girl and wants her back?
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