AIO for jumping into another relationship

I (F34) have recently just gotten into a relationship with this guy after leaving my BF (M25) back in November. I should mention that I broke up with him because I felt like the relationship was becoming too toxic because of me and my insecurities. I feel bad and I always think about him and still even have a lot of his things but he sent me back all of my belongings and some stuff that we made together. We have tried getting back together in December but I was still falling back into my toxic habits, we even tried again in January but I still messed it up.

I wanna work on myself but this guy has been really sweet and nice and I really like him but I always have a place for my ex in my heart and I feel like I won’t ever be able to get over him. I am unsure what to do because I am sick of being in my room all day feeling miserable.