I always feel like my boyfriend will leave me and get worried. How can I stop stressing?

My boyfriend never indicated that he wants to leave me but I feel like he wants to leave me and I stress out and feel scared. I always need him to tell me that he loves me and that he is staying. I need him to comfort me all the time. Why is that and how can i stop being this needy?
I always feel like my boyfriend will leave me and get worried. How can I stop stressing?
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