Only psychoanalytic dream interpretation is scientific dream interpretation.
Dreams are the compensation of reality, the release of repressed emotions in the subconscious, and the innuendo of your daytime emotions.
Your dream of taking your boyfriend to meet your parents is a subconscious shaping of this scene and a compensation for your emotional blank. Because dreams are the self-regulating mechanism of the human body, you dream of bringing your boyfriend home to meet your parents, and you two are very loving. This is completely against reality, something that does not exist in reality, but what you yearn for. In other words, you want to have a happy love and get the recognition and approval of your parents. This is the compensation of dreams for reality, also called the realization of wishes.
The characters, scenes and events in the dream are all props of the dream, and the really valuable information is the mood in the dream and the theme to be expressed by these events. As you said, although I didn't know him in my dream, I felt very warm and sweet, and my parents were very satisfied with him. This is a gratifying and happy dream, a beautiful mood and scene, and this warm picture is a deliberate supplement to the pale reality and the effect of dreams on body and mind.
To sum up, the reason for this dream may be what you see, hear and feel about similar scenes and events in reality, and the source of this dream is your inner desire for emotion and your appeal for perfect love. Therefore, when we reveal the truth of dreams, we also reveal the truth of our hearts. I hope my analysis can help you understand yourself and your life.