Ik I’ll make his life hard, how do I end it?

Ok so I’ve been talking to this one guy (km) for a little over 3 weeks now...he’s so sweet and is so focused on his life and future and it’s obvious he’s wanting someone to share that with. I’m completely down for that but I have a rough past that makes it hard for me to trust. Therefore I think I might just hurt him in the long run. I suffer from horrible anxiety and depression and I’m not sure if I want to mess his life up by him having to deal with me. I truly don’t see it working because I’d be questioning everything too much. So the question is... how should I end it without sounding like all the other girls who have broken his heart. (He’s been cheated on twice also)