Welcome to Sober Recovery Jenny!
If it's validation you want, you got it.
At the end of the day, does it really matter if he is, or is not, an addict? You had become really disillusioned, and were unhappy. No rule book out there, or a quota of how many weeks, months or years you have to stay with someone, give him the benefit of the doubt, or sacrifice your own happiness for another person who is clearly not seeing that there is a huge problem right in his lap.
You can spend a lot of time surfing the internet and talking to folks in the hopes of gaining a better understanding of addiction in general, his pill usage, his behaviors and the whole nine yards. But, again, in the end you made the right decision for yourself, and for your future. Everything we do, even the things that have caused us pain, is life's way of teaching us something. Unfortunately we often can't see it for awhile.
Oh, and yes, he's an addict.