My intent is not to discount your feelings, your post clearly states you cared for this guy,
BUT
As QueSera stated, you truly do not know much about the person, which is to be expected, as you have only known him 60 days.
You are 21 years old with your whole life ahead of you, to get involved with an active addict would be the greatest injustice you could do to yourself. Read around this forum, read what people have lived and endured in the name of love.
If you ask anyone here, 'Knowing what you know today, would you do it again.?" Think it's safe to say the answer is a "big hell no".
Go ahead and cry those break-up tears, they are cleansing, write this one off sweets. There are millions of available fish in the sea, that are not carrying around a monkey on their back. An active addict is an unavailable partner, the alcohol rules his world. Number one is the booze, number two is to protect his addiction, so safe to say the only thing he is currently capable of loving is the booze.
Just from your post , the fact that he made you feel to good to be true, i have a real big hunch, he misrepresented himself to you. You see, alcoholics are liars, they cannot tell the truth, they cannot tell the truth, they cannot tell the truth.
Feel free to post all you want it helps to get it all out. You are not alone, we understand. take care.