In a healthy relationship, all parties benefit. That is, you should be a better person for being in the relationship and the other person should be a better person for being in the relationship.
In what way could someone be a better person for being in a relationship with you?
I agree with your sister that this should be obvious to you before you attempt a relationship.
Some examples of behaviors or virtues that may benefit others:
– patience
– clean the house
– wash dishes
– do laundry
– responsible with money
– acceptance of someone’s background/life experiences
– communicate clearly
– follow through with promises
You should also have a list of requirements that the other person should meet to be your partner, as they should have for you. These requirements may include things like:
– clean (showers/bathes daily)
– doesn’t smoke or drink
– attends regular medical and dental check-ups
– in a certain age range
– here are some other examples.