"Don't regret anything", this world is full of selfish people who will take advantage the second they get the chance, some creep up and blind you with love & affection, but when you do any little thing wrong they will be quick to point the finger at you.
Greed is in humans nature, some of us have a low sense of greed and we need to be careful of those we choose to let in to our intimate lives.
You will see the pattern of these types of people, usually it's us who allow it to happen due to being overly generous and caring, we know our the evil we are capable of but choose not to take that path.