He's only up to 6 (though that doesn't include Liltana, since she's too Tsundere to ask him for marriage, so it's pretty much 7) at the current chapter (also author only releases like 2 chapters a year so TL is caught up), but there's some foreshadowing when his architect tells him that his mansion was built with 10 master bedrooms
Lisabeth is the demon princess, different character, she's not introduced until next arc. it's understandable you'd forget about Liltana because the author forgot about her too
I think I prefer this new girl over Teles and Silk because this girl would be a fusion of both of them... AND WHAT'S MORE?!!!! She has a bigger... than the two...
Six years ago you let a stranger buy the necklace you both looked at... why don't you remember me!? Girl, seriously, that you remember him and seemingly wanted to marry him all this time based on that one event is far more concerning.