How do you get past a relationship where you were the problem?

Its really hard bc he was everything i wanted. I messed it up bc i wasnt ready( theres more to this but itd be lengthy) i feel my mind tortures me bc they were the best person Id ever had.It makes me feel like i should just stay out of relationshipsand maybe find happiness being single and alone. But im struggling moving fwd. I feel guilty,angry,sad. I tried therwpy looking for another bc he isnt it his advice is too surface level. Pls help... edit: the guy isnt much help. When i vented my issues he just suggested financial solutionslike me being a hair braider and spewking positive affirmations over myself.ECIT: THANMS GG THATS A GOOD LIST