I have to say, after digesting it a bit and rewatching episode one, I think they made the right call for Moiraine/Lan. I know there's been a lot of criticism about them behaving like two children - and it's not not wrong - but Tomas and even the others make it clear why this is happening. (Not talking about book spoiler-y other things obviously.)
Moiraine and Lan haven't had to really talk to eachother for 20 years. They've relied on the bond the way you or I rely on talking things out. It would be like losing your sight or your hearing. Of course Lan's frustrated! Of course Moiraine is closing off! They don't know how to be together without the bond! It would be weird if they weren't struggling, these two are shifty, stoic, stone-cold fucking weirdos who are now traumatized!!
Moiraine has lost her connection to the source which is directly compared to being assaulted, and Lan is completely helpless. He can't just fix it. He can't fight it. He can't even support her because she won't let him. Meanwhile it's like he's lost a limb and everybody is telling him that it isn't about him but it is. It's about both of them, grieving the loss of this powerful connection they had.