Warning! The following contains spoilers for the Season 3 premiere of This Is Us. Read at your own risk!
This Is Us returned to television, and for once, answers were flowing more than tears. The ambitious Season 3 premiere gave folks a lot of new information to chew on, including some interesting new information regarding the flash forward timeline. The scene started with Tess and Randall leaving her office to go see "her," and Randall rung up Toby to ask him if he'd be joining them. Randall encouraged Toby to come but his brother-in-law seemed rather apprehensive. This might be due to one major detail folks may have missed, as Toby was not wearing his wedding ring.
It's a potential reveal This Is Us fans don't want to hear, but it makes sense given the scene in question. After all, if Kate was "her," wouldn't Toby be right by her side? Furthermore, one would think if Toby is important enough for "her" to want him to be there, Kate would've extended the invitation to her husband. If the two are split and Kate is wherever Randall and Tess are going, that may explain his apprehension in wanting to show up despite whatever is going on.
If Toby and Kate are done, This Is Us just opened up a lot more questions in its Season 3 premiere than many had going in. Are they going to split because they can't have a baby? Does Toby's battle with depression play a factor in their marriage's collapse? Is there a way the two could find a second chance at love in their old age? It's so unfair that This Is Us would drop the bombshell the two have split not long after viewers saw them get married, although as far as storylines the show would create to make fans cry, this is par for the course.
Before we get too wrapped up in This Is Us Toby and Kate divorce theories, it should be acknowledged that this could be a red herring. Toby might be one of those guys that takes off his wedding ring when he goes to sleep, and Kate might be in the next room oblivious to the phone call taking place. Perhaps Toby doesn't want to see "her" because he knows he'd have to bring Kate, which could cause some drama between her and whoever is there. Keep in mind this is several years into the future, so there's really no telling what family feuds and drama have unfolded over time.