How long has Clark been in Melbourne now? A couple of weeks? Yes, he and Lois are feeling a deep attraction to each other, and things are progressing in a positive direction, but I don't see a lot of possibilities prior to this for Clark to have told her. When they were just colleagues, no matter what Clark's feelings were, it would be an awfully big secret to share. If he had in fact been able to fly to Melbourne to see Lois, presumably he would have told her then, which would have made it considerably earlier in their relationship than canon.
Rotten timing and rotten luck, as usual. And it all contributes to some great suspense, Corrina. Looking forward to seeing what happens next.
Kathy