My girlfriend is so hard to please I feel like moving on from her?

It's getting annoying. i buy her all these gifts and shes NEVER heppy with it. she always whines about me not spending enough time with her but she never says no to that new phone i bought her, she never said no to that new dress i spent �120 on. my dad owns his own company and he even offered her a job but shes turned it down to stay at home and help her disabled mother talk about dumb decisions. this is my week timetable, i'm at uni monday to friday i work the whole of the weekends for my dads business, I train every monday tuesday and friday, hang out with my friends on wednesday and revise to catch up on uni work on Thursday, so with this packed out week how the hell can she even think about me spending time with her. Shes' lucky to have a guy like me. i am not your average guy i am every guy any woman would dream of because i am that special. i feel like punching her ovaries she makes me so damn mad. how do i tell her to keep her stupid b**** a** mouth SHUT for once and appreciate everything I do for her? Why are women NEVER EVER satisfied to what a REAL man has to offer?