This dream certainly indicates that this crush has a hold over you emotionally . She has the " key " to your place and that place rather than your home is your deep emotions and inner self . This is clearly expressed in you giving her the " key " . I also feel you have a desire and need for her to unlock the best in you . To bring out the best in you and you may lack confidence at this time . You also feel that other people are abusing her or are a threat to her . In itself your subconcious is trying to convince you that you are better for her than what she has

Blessings . Peter