"The key to any long term relationship"
I've been married 40 years.
How to stay married.
Keep your pants up around other people.
When you argue don't hit below the belt.
Don't use sex as a weapon or to manipulate.
If you want to be trusted, be trustworthy.
Never ever hit them.
Be aware it's normal to argue and don't really expect the other person to think like you.
Sometimes you both just need to distance yourself if tensions are high so you don't say things you regret or have to live with permanent damage.
Spend time together without always thinking you have to talk.
Forget what you see on TV how ideal relationships should be.
There will be good days and bad days. Good months and bad months. You might even think your relationship at some point is done. If you both actually love each other but can't see through the frustration, give it time. Don't expect quick resolutions. Don't give up and stop trying.
The things you argue about when you're young, you'll may still be arguing over years later.
Don't think you're going to change the other person.
Practice unconditional love.
Just try to be nice and expect the same from them.