I am afraid that "living normally" with an actively-using addict is not really an option, my friend. Have you ever been to Nar-anon or Al-anon? These are groups specifically for the loved ones of addicted persons, and can offer tremendous support whether your boyfriend is using or not.
Accepting that we did not cause, cannot control, and cannot cure our loved ones' addiction is a good first step towards taking care of ourselves regardless of what the addicts we care about are doing.