Relationship anxiety

About a year ago, I got out of a toxic relationship with someone. I’ll call him J for short. J used to do things that didn’t make me feel good. He would make me feel bad about myself physically any emotionally. He quit putting effort into our relationship after a few months. He even lied about loving me. He was pretty awful. I was pretty messed up after the breakup and when the truth came out. I’m much better than I was a year ago, but there is some anxiety left behind from that situation. I’m now in a new relationship with someone who is so much better. Even from the relatively short amount of time I’ve been with him (we’ll call him B for short), I’ve been able to tell that he’s kinder and a better fit. He’s very kind and he wouldn’t deliberately do anything to hurt me, unlike J. B is very open to communication and listening, unlike J. Even though there are countless things that prove that B is not like J, I still get worried that he’ll do the same things that J did. I know it’s not true, but my brain keeps bringing me to that fear. Are there any ways I can alleviate my anxiety?