Why do some men string girls along?

This is why so many people have trust issues. Why are some guys so selfish that they string girls along making them think the relationship is actually going somewhere but it is not. Am I right or wrong? If a guy really wants you, he will do everything he can to make you his girlfriend. There is no "Im confused, or I'm not looking for a relationship" Those are bs excuses guys use to make a girl think she has a chance. Why talk to her everyday and all day even though you probably aren't going to get sex? Why invest so much time? Do guys desperate for female attention do this?
Why do some men string girls along?
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