First of all you cannot make anyone do anything. You can only change your behavior. Second, you have to know when to let go of something that is bothering that someone did to you.
When someone shows you they are not interested, that's fine, because they are too insecure to tell you, then you must take their actions to mean what they cannot say.
There are plenty of other people to date. Don't worry about that one particular girl and don't make every other girl suffer because that one was a problem.