I'm going to confront our upstairs neighbors
What do you want to confront your neighbors about?
Because they don't care about my feelings and they want to ruin my marriage
I can see why that would make you upset, but confronting them could make things worse. It would be hard to deal with since you live so close to them. Maybe do not confront them, so you can live there more peacefully, and try talking calmly to them instead.
I can't live in peace when that asshole pisses me off.
If your neighbors are taking actions to disturb you. It would be best to consider talking with them so that they can get to know you. This may help them to change their actions toward you.