Poor: very low income. compared to many. He usually does not or cannot own property. His home is usually of lesser quality, sometimes due to uncaring landlords who may also be the Poor person's employer.
Pickpocket: During your youth your family fell on hard times forcing you to turn to petty theft and other criminal activities involving you with criminal organisations.
Rivalry: A rival to you or your family cause upheaval forcing you to relocate possibly to a far distant land. (Work with your DM to detirmine the details)
You find yourself in love with another, wither it is a fling or something more serious is up to you. (work with your DM to detirmine if it is ongoing or terminated)