Hey Belle,
Welcome, I'm glad you joined us.
If his drinking is a problem for you, then it's a problem. It doesn't matter how much he drinks, or what he drinks, or how "functional" he may seem.
If he's forgetting what you talked about the night before, that is another big red flag.
How do you deal with this? Well, you seem to be doing just fine. You came here and reached out to people who understand what you're going through.
Have you thought about going to Alanon meetings? That is a great way to meet people who can offer experience, strength and hope.
It's hard to have a soul connection with someone when you feel like they might be lost and in trouble. It makes that soul connection feel a little bit blurry and not as focused as it once was.
Stick around, there are lots of good people here who understand where you are with this.
Peace,
Gabe