I guess you and I read the same great biography of Pompey by Robin Seager.
However I disagree on the point about Curio. Of course Curio had his own ambitions and he certainly, as any roman young ambitious noble, prefered a situation were 2 imperatores were not over-shadowing the whole roman political stage.
But I think Seager is wrong in supposing that Curio bypassed Caesar and forces him into conflict with Pompey. Caesar had his dignitas. And my guess is that he did use Curio to exert pressure on Pompey because he (rightly) felt that Pompey was playing double-game and deliberately undermining his own position.
Pompey could not ignore the situation in Gaul. Pompey could not ignore that Caesar could not come back to Rome in late 50 because he needed the whol year 50 and even the first months of 49 to settle matters in his Gallic provinces, to celebrate his triumph in Rome, and then to be candidate for a second consulship that could only have been the consulship for 48 because of the law demanding a full 10 years delay between 2 consulships (having been consul in 59, Caesar could not be consul again before 48 without a special law granting him a derogation).
If Caesar had felt Curio had forces his hand, he would not have made him his most important lieutenant until his premature death in Africa against Juba of Numidia.
Now, to come back to the subject, if Caesar and Pompey decide to remain allies, they will certainly have some solid deal lasting for at least 4 to 5 years. Don't expect the 2 men to split quickly if Pompey did precisely refuse to do in this timeline what he did in OTL.
The most probable next step is that only natural or accidental death will then put an end to their alliance. Pompey was coming close to his sixties. Caesar was 6 years longer.