Based on your description, of course it’s you. He thought of the memories between you, but so what? He already has someone else. You can never go back to the way you were in the past. The fact that you come here to ask questions shows that there is still an empty place in your heart to wait for him to come back. You will still hesitate to accept him again one day. I advise you. No, you should look forward and find your own new happiness. Stop asking questions here. If you have questions, ask your own heart. Others can only give you advice. Think about it!