Reunited with ex

My boyfriend and I broke up 2 weeks ago. I didn’t say a word to him even though he texted asking how I was doing after a week. When it had been two weeks I decided to text him because at the end of the day I didn’t hate him and appreciate the time I spent with him. We ended up meeting up and having a cordial conversation which was what I was looking for, but this led to it getting super late and him spending the night and us acting like we had never broken up. But then the next morning was back to reality, and now it’s so much harder for me to move on because I can’t stop thinking about how great that night was and wishing we could go back. I know we are not getting back together though. I just need to move on.