Feeling unsafe in my relationship, is there a way I can change it?24F & 30M,

My, 30 M ,bf and I, 24F, have been together for 5 months. Most days I feel extremely loved and happy with my partner but then I have many days where I feel so unsafe, I feel like he is going to leave me anytime because he’s had enough of me. He has a quick fuse which tends to make me scared and nervous which will cause my brain to spiral. I tend you feel like he’s going to leave me so I ask him if he still loves me which I know can get very annoying. I don’t know if it is me personally that is maybe just wired different and have a constant worry of my partner not actually loving me or will leave me at any time. I have never felt this unsafe and insecure in a relationship before.

I feel like I can make myself feel more secure and safe in the relationship but don’t know how?