I'm going to break up with my boyfriend because of white lies he kept telling
What does he tell you?
He kept telling me how he'll fix the situation later when I asked him to help me with my math homework.
I can understand how that might make you frustrated. You should try and work out minor problems with others. You don't need to rely on him for help all the time, you can find someone that might be able to help you better.
No, I'm going to break up with him. He's a total dick and it's no use helping him.
It is normal to feel frustrated if you feel unsupported. He might not be good at what you are asking him with I think a professional or hired help might be a better fit for the situation.