Why do I dream of having a girlfriend?

If you don't already have a girlfriend, your unconscious is telling you your desire to have one. Unless you have a person of interest, the girl you dreamed of that you don't know is insignificant in your dream - unfamiliar faces in dreams are often people you have encountered in your life that you're not aware of.

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Then, what does it mean when a guy tells you he had a dream about you?

What does it mean when a guy says he had a dream about you? It mostly likely means nothing. Dreams =/= predictions or deep feelings. We can postulate that he was thinking about you in excess, which is corroborated by your saying that you know he's interested in you (but how do you know that?). Can you fall in love with someone in your dream? So the answer is NO - it's not possible to actually fall in love with a real person by dreaming about them. Dreams can let you be open to seeing someone in a new way, but you need to know the real "them" in order to fall in love with them.

What does it mean when you dream about someone you used to talk to?

It's natural to think that when we dream of someone we used to talk to a lot or be together with, it is a sign that we still love them or are being given a sign to get in touch with them again. What does it mean when you dream about falling in love with someone you've never met? Dreaming about falling in love with a stranger doesn't mean you're ready to leave the relationship. Instead, it's your subconscious way of escaping the stress and anger that comes through arguing to give yourself a bit of a break. Something we all need every now and then.

Regarding this, is it wrong to dream about another girl?

And should we be concerned for the future of our relationships? Being intimate with someone else in a dream can indicate that the dreamer may be too dependent on someone else in real life and the psyche is encouraging the dreamer to break free.