My girl friend always makes me pay and I hate it...

My brother's story:
I need a solution to this problem I'm having with my girl friend right now, thanks in advance for any suggestions. So I just recently started a relationship, we been together for just 2-3 weeks. We hung out 3 times in which I payed everytime. I drive to her, pay for gas, pay for dinner, movies, and anything that we do. I end up spending at least to $100 everytime we chill. She makes more money than me, she has 2 jobs where as me...I'm a student and only have a small part time job. She has never offered to pay for anything. When we goto the movies she just stands there when she orders the tickets, I don't want to be like "hey can you pay for youself?" so I just pay and don't say anything.Even worse, yesterday she bought this pendant and asked me to pay for it. A little rediculous for sure. You know, that's a big deal to me. The first time is fine but now it's like routine for her to do this. What should I tell her, and how should i tell her about this problem? I don't want to sound poor and be like "my money is tight want to go half half next time". It'll be weird.

 

Not working today, tomorrow or next week. Give it up.