Advice please!!

So I’ve been with my boyfriend for 5 years. We’ve been on and off before and about 2 weeks ago we constantly would be arguing about little things. Last time I saw him we argued so bad and we said we can’t be in a relationship like this and he left. Turns out he thinks I only want to be with him because I’m scared to be alone. He misunderstood what I said I’m scared to loose him I’m scared that one day he will wake up and leave me and leave me heartbroken and stranded. We went on a break and 1 week we did no contact so I can show him that I’m fine alone and that I’m not afraid. It’s been 1 week today and he talked to me but later we might talk face to face. What do I do I really love him with all my heart how can I get through to him. During this break I realized what I have and that I should never take him for granted...