2 horses are better than 1, since very few of them will be happy alone. I have 3, so whichever one I take out, there are always 2 at home together.
Sometimes I take both riding horses but that's not very often, and my older, retired gent doesn't get upset if he's alone for a couple of hours, especially since my neighbor has 5 horses and he can see them. I'd be hard pressed to leave him by himself if there weren't other horses within sight, though.
Welcome to SW Virginia. Beautiful, isn't it? And there are tons of horses and horse people in the area, so you shouldn't ever have to ride out alone.