These four ingredients can be used in every sort of relationship.If u want them to be longg lasting..
They are as follows...
1) Trust: You have to trust the person with whom u want to have relationship
2) Respect: You should respect each other.
3) Compromise: The two of you must compromise in different matters.
4) Patience: The important one..both of you should remain patient and take decisions after a deep thinking on every matter