That’s strange… do you have 10 or more affection points?
If so, Liev should propose — at which point you need to reject his proposal, then go the wrong way / run out of time when you are given options of dodging his attack.
Basically the only real difference between 3A and 3B is that 3A occurs when your affection points are too high (>10), whereas 3B occurs when your affection points are too low (<5). Aside from some differences in dialogue, they pretty much end in the same way.
Hope this helps! ^^