Thank you for providing a little more background. I hope this dream interpretation is helpful for you.
If this were my dream experience, finding myself in the shower would relate to emotional cleansing and would be a form of healing myself and ridding myself of residual or old emotions that no longer serve me. My ex entering my home would symbolize for me how my thoughts and feelings about him are still present and are still with me. My dream would hint at the idea that I am expecting them to go away. I would view my dream as reflecting my thoughts and feelings more than they are reflecting my ex. His presence would indicate my thoughts about him.
I would also wonder if his announcement that he is back reflects my wishes and desires. The full hands and chest would symbolize for me how I am carrying my emotions around and they are taking up so much room that I am unable to hold, or focus, on anything else. The pressing of the sides of the head would also relate to the pressure I feel from my intense emotions and thoughts of him. I would relate this to how thoughts of him continue to push forward even when I attempt to avoid them.
The dreams I heard from others would reflect a few things for me. I would regard them as reflecting what the dreamer thinks, believes or wishes for me. Although they would support my wishes and I would hope they indicate something else, I would recognize that they could also be symbolic in nature or reflect thoughts or beliefs rather than what may come true in the future.
My ex's mother would symbolize the emotional and wise part of my ex that I would like to connect with. She would verbalize in my dream what I would like to hear.
I would regard each of these dreams as providing an important function of healing and personal development. All dreams would help me identify my feelings and allow me to continue to process them and take better informed actions regarding my relationships based on them. I would explore further what my ex's mother shared. Although I may want my ex to be sorry, this may or may not be the case. This dream would help me explore what my experience has been with my ex and if I am willing to have a relationship in the future with him. Although the dream may reflect what I want and what is ideal, I would note that these dreams have not occurred and they would help me determine the boundaries I would want to set with my ex and what behavior I may accept versus not accept.
I hope this was helpful for you. Please let me know if you have additional questions. Happy Dreaming!