Should i leave him? its gone bad?

i have been with my boyfriend for 2 years now, at first it was amazing, i loved him, i still love him deeply, but all he does is make me upset. everything i do is always wrong to him, he hims faults in me all the time. i fall asleep most nights crying, and it has got to the point now that i have started to cut myself. is it best if i leave him and cut the negativity out my life? help