Moving in with BF

A
So my boyfriend and I are on the hunt for apartments in my colleges' town. I'm super excited to live with him but I nervous he won't be able to pay his part of the rent. Honestly, he is terrible at paying bills and if he messes up with our rent I won't have money to cover him. I've seen him not pay his car and his insurance payments and his credit card payments so I'm very hesitant. I've had this talk with him and he says I have nothing to worry about but i dont know. Any thoughts?