The nice girl makes the mistake of being available all the time.
Many people lack the basic equipment to be in a relationship and there's nothing you can do to change it. You can't take a skunk and dip it in perfume and hope it becomes a puppy. Eventually, the perfume will wear off and you'll still have a skunk on your hands.
Agree with everything, explain nothing, then do what is best for you.
Men control the world, but women control the men.
Anything a person chases in life runs away.
Standing up for yourself doesn't always involve verbal confrontation. Sometimes it's about not wasting energy on people who are negative.