If your boyfriend doesn't contact you often because he is always busy what does that mean?

Depends...

Does he work a lot? Does he have a lot on his plate?

If not, if he's just hanging around the house or with friends it means he doesn't care for you.

Really you should talk to him about this, he is your boyfriend after all.

Tell him how you feel and ask him why he is ignoring you.

How often does he contact you? And how old are you? And I agree you need to talk to him about this-he's the only one who knows.