Ex Girlfriend acting hot and cold?

After about a month and a half of no contact my ex contacted me, since then we have kept in touch but her behavior is strange. Sometimes she flirts with me and acts as if nothing happened and then somtimes she takes hours to responds or just doesn't respond at all. What does this mean and what should i do? I know she's in a rebound realtionship.
Ex Girlfriend acting hot and cold?
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