Western Guys Marrying Pakistani Girls: Dilemma

Thats the annoying thing really. Its not actually her.. its the bad relationships Ive seen around me go bad. The situation with the bro, the fact she maybe in it for the passport/$$$? Though they do have a very nice family, they have a really good family relationship with the community, never actually asked people for money no matter what their circumstance, dad even said they are not the typical pendus you see everywhere.. The fact is you hear guys/gals that come to the west change their attitude when they get her, so theoretically she could change.. maybe Im looking to much into it.