How do I get him to stay with me?

I'm worried he will leave me even though we love each other so much, my boyfriend never gets past the 3 year mark in a relationship and we have been together 2 years 11 months. We are doing okay but he has admitted to things being fine at this point in past relationships but they still just end. I love him more than anything and want to spend my life with him. How do i get him to stay with me?

How do I get him to stay with me?
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