It depends on what he is doing. Is it hurting you? Does it really bother you? You need to have an open communication, tell him your thoughts and he should do the same.
What kind of things bother you about him? Is he watching porn? If you can tolerate and can take him as he is, then you should let him do whatever he's doing. If after talking to him about it and that it still bothers you, then, I think you should move on and find someone who has the same tastes and values as you.
Take care.