Long lasting relationships with anxiety

Hi there girls. I was just wondering if some people could share their success stories in love even while having mental health problems. I have quite severe anxiety and my mental health has been the reason a lot of past relationships end with me. It’s built a lot of trust issues. So much so my current partner who I am convinced is the one for me always says he would never leave me over my mental health, but how can I believe him when the others said the same? I’ve been feeling incredibly worried about losing him recently that my brain is obsessing over it and I spend all day feeling like I’m walking on ice. I’m 18 and obviously want this to last my lifetime, can some of you share your successful relationship stories while battling mental illness? I want to know if it’s possible.