My boyfriend never bothers to call or message me regularly, he ignores me as well. What should i do?

i am in relation with a guy,we want to marry each other,he has talked with his parents,the problem is that he is of very careless nature,he never bothers to call or message me regularly..we talk only when i call and suddenly he starts igoring my calls..he does not give me time..i have told him about this but still no change in him.. what should i do. I need him and his time.