Bf troubles..

Seems my bf can never stay happy we have 1 child together and one on the way. He smokes a lot of weed and wont stop. He seems like he can never stay happy. Ive been with him for almost 5 years and it seems he gets depressed easy but always blames it on me. Its so hard to be happy around him bc hes out to get me down bc he is. It sucks 😟its also sad bc he always swears around my son. I hate it.