Will I ever stop having relationship anxiety??

Y’all, I need advice. I’ve been with my bf for almost 3 years, we’ve been living together for 7 months, and I STILL get major anxiety that he’s going to cheat/leave.

He’s never been unfaithful, never has given me a single reason to feel this way but yet here I am with a ball of anxiety in my chest.

For those who felt the same but are managing it, or even overcame it, HOW?! What are some ways y’all have coped with this? Any advice for this stress queen is welcomed!!