This dream may symbolize feelings of being watched or judged by others. The unknown person staring at you could represent a fear of being seen or exposed in some way. The past ex may represent unresolved feelings or unfinished business with this person. The hesitation to have sex with them could suggest a reluctance to revisit the past or a desire to move on. The abandoned house could symbolize neglected aspects of yourself or your life. The fact that someone was living there could suggest that these neglected parts are still present and need to be addressed. The trash bags and lived-in appearance of the home could represent the messiness and chaos in your life that you may be trying to avoid. Driving away could symbolize a desire to escape from these issues. Overall, this dream may be urging you to confront and address any unresolved emotions or neglected aspects of your life in order to move forward and find peace.