Relationships evolve not only with the growth of each of the members of the couple, but also with how their lives change. Moving together, working full time, monetary issues, and having kids. That last concept is actually the most difficult one. Having kids can bring the couple together, make them feel more like a family. But it can also be the last drop on the glass that makes it break. Children are a lot. They cry, they scream, they tantrum. If your relationship isn't built on a strong enough foundation, then the whole building comes down with it. And you will be quick to blame it on the kids, but it's actually something deeper.
Is hard to maintain a relationship through the good and the bad. But having meaningful and serious conversations along with lots of love can make the whole thing not that hard at all. Kids get in the way sometimes, but that doesn't make them less desirable. And I'm pretty sure that they aren't the full reason why couples break up, is usually just the last thing in a long list of problems. Your kids are the outcome of a relationship, and let's hope a healthy and loving one. So why would they be the reason it ends? It may seem like maybe there is something much more realistic bothering the two lovebirds that isn't really the reason they think.
So if your relationship is struggling and the main issue seems to be about the kids, like the story below, talk to each other. Be honest and truthful to yourselves. Admit whether the problem is the kids or some bigger issue you are ignoring to avoid having to confront it. If the foundation is strong enough, then you can survive even a rough patch of arguments and disdain. No kid, school bus, nor anything can actually be the ruin of it. But it's important to stop with the arguing and start having meaningful conversations that can make the relationship move forward and continue being as loving as it was before.