/As a reader, I honestly cannot see who Jace is suppose to be because I keep getting conflicting information about him./

Exactly, which is why Clare's attempts to paint him as misunderstood and sympathetic fall flat. He angsts and broods for one minute and then spitefully taunts other people the next. He throws fits of self-pity, but then prevents the reader from feeling sorry for him by showing no consideration for other people's feelings and acting like a horrible brat.