2, 10, and 15!!
who apologizes first? in what way? is it hard for either of them to apologize?
Apologising would mean acknowledging that they had done something wrong to begin with, which they’re both reluctant to do. Amy because she’s generally convinced that she did the right thing, no matter what, and Dan because even when he KNOWS he did something shitty, he doesn’t want to admit that he has a rudimentary conscience and is capable of feeling apologetic.
At least, that’s been the status quo so far. However, we’ve seen Dan adjust his behaviour in season 6 once he realised he’d upset Amy, so I think it’s safe to assume that he would be big on wordless apologies.
if something already happened to tear them apart, what would make them come back together? is it even possible
Depends what broke them apart in the first place, I think. I tend to doubt there’s anything Amy could do that would drive Dan away from her permanently (theoretically cheating on him might be enough – but I think that would be rather out of character for Amy, so it isn’t really worth considering). Amy is absolutely capable of cutting Dan out of her life if she feels it’s necessary – and while I hope he’s learned his lesson in that regard, it’s hard to be sure.
What would bring them together is as simple as we saw in season 6 – they are very attracted to each other and have a strong emotional bond, however reluctant either of them are to acknowledge that fact, so on the most basic level…they don’t want to be away from each other. But depending on how badly Dan had screwed up, I think he would have to be willing to declare his actual feelings – he got very lucky that Buddy was so terrible, because if he hadn’t been, and Dan had persisted in his complacent assumption that Amy would never, ever want anyone as much as she wanted him, Amy wouldn’t have come back to him.
Season 6 leaves us with a kind of blank, as it’s still not clear if Dan has actually had the realisation about Amy’s feelings (and his own) that his actions seem to indicate he must have had – and I think acknowledging those realities to himself would be crucial if Dan was ever to make a romantic declaration that Amy could accept as being sincere. So some level of maturity beyond what we’ve seen (and Dan is quite emotionally immature, what with his inability to recognise that actions have consequences and people are going to react when he treats them badly) would probably be necessary if Dan pushed Amy to the point of cutting him out of her life for a second time.
who misses the other more, or really thinks about them more?
Amy probably consciously misses Dan more – I can very definitely imagine her sternly telling herself not to think about him, and not to miss him, and so on and so forth. Whereas, I doubt Dan articulated his feelings to himself as such, but I think his behaviour indicates that he was missing Amy a LOT. We hear a LOT more about Dan sleeping around in season 6 than ever before, both from him and his co-workers (Jane explicitly mentions that he’s probably diseased), and it’s hard not to think that some part of that was trying to fill the hole left by Amy’s absence. Which is still kind of hilarious to me, that the only way Dan could manage lacking Amy’s companionship was to have casual sex to an almost compulsive degree – if nothing else, it speaks volumes about the true nature of his feelings for her.
I would lean towards Dan here, but in all honesty, they’re so co-dependent that I’m not sure one misses the other more. I think Reid Scott said at one point that “they need each other” and I think the sudden shift in both their demeanours when they’ve finally given in to their desires and started to plan a way to be in each other’s lives 24/7 the way they used to be, illustrates that point quite dramatically.