My pregnant girlfriend says that she can no longer help me out financially, is this a sign I should notice?

I've known my girlfriend since 2008, when we first dated. Our relationship lasted for 4 months the first time. It was rocky, neither of us were truly happy, and I did cheat on her. I didn't sleep with the other woman, but I went out on dates with her behind my girlfriend's back, which is still cheating. I came clean about it, and we decided to end things. We started talking again this past summer, we both realized that there were a lot of things wrong with us the first time around. We decided to give it another try and have been together ever since. She became pregnant in the fall, and is due in July. We have both had our ups and downs with money. Sometimes we both have it, other times only one of us will have it. We've always had each others back money-wise. I decided to go back to school this Spring term and quit my job, and while my financial aid has kept helped keep us afloat, it is gone. I was supposed to get my tax refund last week, but because I did an amended return it's going to take another 30 days. I can't afford to miss class next week because of tests, and she knows this. I don't have gas money to make it all the way through the week and she knows it. She's telling me to make other arrangements even though she gets paid next week. I know we still need stuff for the baby, and she has bills. She doesn't drive, but I do pick her up from work everyday. I know about her financial obligations to herself and our baby. But doesn't it say something that the person I'm in a relationship with won't help me out when she knows I truly need it? Plus, she knows I'm going to be getting money soon, and I could repay her. Not only that I have 3 interviews for part-time jobs next week. Am I making a big deal over nothing or is this a sign that she truly doesn't have my back when I need it the most? Looking forward to all answers. Thank you.