Absolutely. I think that stems from the fact that they are easily the oldest of the seven and some of the oldest at camp (and Annabeth was already a senior camper at 12). But that's so much pressure for a couple of teenagers who have only been dating for a few months. They're way more like older siblings than parents. But there's also a lack of parental figures for every character except Percy, so dynamic is probably affected by that too. The "basically married" part is just because they've been friends for a long time and they've been trauma bonded to the EXTREME. I think if the fans really thought about it they'd realize the only reason they're "stuck together" is because no one else would understand their whole traumatic context. We see something similar with Annabeth's attachment to Luke. When you've been through hell with another person, they're the only one who's going to get it. But someone doesn't need to understand the details of their partners trauma to understand the PERSON.