---Not Kpop Related---sorry

Hey so I just recently got a job and I was hoping to save up to buy myself my own phone around December or January, and I also did the math and everything.
But just recently my older brother asked me to treat me my, younger sister and him out to eat and I was like sure I mean It's just us right? We are family. And I spent over $40. T-T Honestly it hurted when I swiped it lol. But I was like we're family it doesn't matter. But then today he asked me to lend him $30 to him to go to a concert!!! I don't want to I mean I was thinking of buying myself a school shirt that costed around $28 but now I don't think I can T_T
I mean he's not a bad person He's actually a cool person I hope you guys don't misunderstand, but I think that's why I could't say no to him.

What do I do??!?!