How do I stop loving my current girlfriend so I can break up with her?

I really want to break up with my girlfriend so bad, but I have a strange feeling of love for her. I tried to break up with her twice and I still came back to her out of love, but I really want to find someone else. Because I've been looking at this girl who I have a crush on and I want to stop loving my current girlfriend so I don't have any pain from her after.
Updates:
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I left some details out of why I want to break up with her. So I'll just tell anyone who replies to this question.
How do I stop loving my current girlfriend so I can break up with her?
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