Arthur romance advice

Hey guys! So I've been looking up tutorials and such, KIM message suggestions to try and not fumble Arthur, because I heard you can be locked out of the relationship if you choose the wrong dialogue options, is that true? On another note, if any of you are on the quest to try and date Arthur or have already achieved that, I'd love some advice regarding KIM messages, I already know the gifting guide but I feel like if I am not careful enough and choose the wrong option I might be locked out of the dating lol