Most Helpful Guy
It won't mean the same if you're drunk. If anything he'll dismiss whatever you said simply because you've been drinking.
Most Helpful Girl
Honestly you suould tell him sober. Is it really worth being with someone for so long and having them not feel the same way? I would tell him that you like him a lot. See his reaction, if he reciprocates the feelings, Then tell him that you love him. On the other hand if you really do want to do it under the influence, I'd play my cards right. You might say more than you bargain for.