While Doug was really in love with Julie, he married Addy because of her money. She bought him Doug’s place, and, yes, he eventually did grow to love her and probably would have stayed with her had she not died.
I didn’t go into the ‘Scotty-line’ because THAT one is just toooo mind boggling.
One reason some of us old-timers remember all this is because they’ve become family to us. Heck, I’ve known these characters longer than some of my own family.