Don't stop dating once you move in. They shouldn't stop either. Plan nights out, random gifts, and movie nights together. You're not roommates, you're partners.
This one might be controversial, but if you have ex's "you're still friends with" no you're not. Early in the relationship people will say, "Oh, that's cool. I don't mind." Because you're in the honeymoon phase, but it's just all around awkward for everyone.
Sorry, that's just bullshit. I have been married for many years and am on friendly terms with 90% of my ex girlfriends. My wife was sceptical at first (which I get), but now she is friends with several of my ex girlfriends.
Others, not so much, but not because they are my exes, but simply because they're not compatible.
"My wife was skeptical at first" hence, awkward for everyone. Most relationships end because one side ended it, which creates asymmetric feelings. Are there exceptions? Sure.
I think the exception to the friend who you dated would be my friend who we only went on one date and didn’t feel a spark but still liked each other. She became one of my best friends. She’s now married and my partner and I double date with them.