If you do a suspension lift like I descriped, your lowering the control arms with respect to the truck, and it will keep the ball joints, cv axles, etc at the factory angle. If you crank the torsion bars, it will put accelerated wear on those parts, because your changing the angle of the control arms with respect to the truck.
A body lift, like Blue_12 did for his tires, makes no changes to the suspension and therefore does not harm the parts. The only point of a body lift is to allow the use of bigger tires without changing the suspension. The bigger tires are what give you the extra ground clearance.
LOL, no offense, but it really sounds to me like your boyfriend has no clue what you are capable of doing with a truck. There are some ways to lift it that will harm the truck in the long run, but there are also plenty of safe ways to do it... they just usually cost more. My point in getting into this is to say don't let him stop you from doing what you want. If theres something that strikes your interest, there are plenty of people here that can guide you through it!