This should be the most important rule or concept of all, never mix relationship with business. Be it friendship or marriage.

For friendship, you can help him out during difficulties by offering assistance but never borrow money. Once you loan it to him, prepare to donate it away as there is high chance that you will not collecting back the debt and also that friend of yours will avoid you. Hence your friendship would come to the end.

For marriage or couple, do remember not to add any of your personal asset under their control or join name. As Donald Trump once said, even if you are in a marriage, sign a contract stating that all your personal belongings will not be give away to your partner if you happen to divorce.

This is the most essential rules you need to follow which is to discipline your feelings as you get richer, those things you loved deeply will soon be exchanged. A road that every businessman will go through, including me.