My RABF was addicted to oxycodone, too. He did not belittle me or call me names. He became very distant, and became more focused on finding drugs rather than the relationship. He lied to me about the drug usage. He liked to doctors and pharmacies in order to get more of the drug. These are all bad things, but you are talking about sounds like emotional abuse. How long have you known your fiance? This is definitely a red flag in a potential partner.