In addition to what maleficent said about low self-esteem, jealousy is also about mistrust. When you show jealousy, you aren't telling your girlfriend you love her, you're telling her you don't trust her. This can only serve to drive you apart.
Tell yourself that she's a good person, that's why you chose her, and you can trust her to be loyal to you. Give her space, trust that she chose you to begin with, and she'll continue to do so as long as you support and trust her.
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