Rule #1 Dont expect anything from anyone. You should know that from experience by now.
Rule #2 don't get mad if they betray u. They're not perfect and neither are you. So wait till you can betray them back and get revenge, then it'll be even.
Rule#3 Have sex with every good looking person you meet related to them. I usually reserve this for enemies though. She might want you to marry into the family.