They key to a healthy relationship is LISTENING . If you do not listen to your significant other, wether it be to their problems or just simply what they have to say, then the relationship will be meaningless.
Another important aspect of having a healthy relationship is LOVING YOURSELF.
This is exactly like the saying your mom probably told you when you were a teenager “you have to love yourself before you can love someone else”. This is extremely important as well because if you do not love yourself and you have insecurities, you may seem needy to your significant other, causing you to seem shallow.
There are many other aspects but these were the two biggest ones!
I hope this helped! :-)