I can not seem to pass the part where I have to win this girl from (can..

Right if you are in the cantina, you don't need to be there. You need to work for either Czerka or the Ithorians. After doing some things for either one, then you get a shuttle down to telos' surface, and you find Bao-dur. And kill lots of mercenaries. They have melee shields so you might need to save after you have found Bao-dur.
Happy hunting

HI.. There are three ways to do this one is to pay the man 2000 credits witch is the easy'ist way, two is to play Pazac (i hate the game) or three is to report him to the Exchange, to do option one you need a few things, a level up , some good items and two other party members.

Go to the TSF office and to the lockers, the one in the corner, turn on single mode (now save your game if this dose not work reload and start again, it may take a few try's ,it did me.)

Circle the locker ( make sure your two other party members do not have any items on them at all), now use R or L tigger to flip from locker to party member and back again, this is important you rember witch one to use. Now press the A button to open the locker then close it , keep doing this so you get the timeing. Now open the locker then press the start button to goto the level up screen, if you have timeed it corectley you should have a level up screen + the locker invantory box overlayed, well done.

Press A to close then A again to level up, the locker invantory box should again open, press A to close, now rember your practice with the L +R triggers moveing from locker to party member, move it to the party member, then press B to exit level up, press L triger twice to get to item equip screen, use L thumb stick to move highlight from armour to armband ,press A , sudenley a dialog will start close by useing D pad to select your answer, then press A to hilight item again then press to change character, they will say somthing like "ready, or yes" press A again.

You give item to that party member, do this with both party members, with all th items your Main Character has, once they have all their slots full exit screen and save, then load the game and you have duplicated your items now you can sell them for loads of dosh and buy the girl. If you have upgraded wepons down grade them befour you sell , you get more money.

Hope this helps if you want any more idea's let me know and I will do my best to help..MAY THE FORCE BE WITH YOU......