Anonymette, you sound like a really nice person and very young. Please do look into the recommended resources.
You just do need to know that the bottom line is, addiction is not something that can be worked out between two people. It's not like deciding for example, where to live, or whose job will take priority, or whether to support someone through another degree, or other important life decisions. Addiction is a threesome, and the non-addict is the third wheel. Keep reading and good luck to you.