im getting tired of this

My bf and i are in college. He works fulltime and i dont. He knew this when we first started dating. His parents pay his rent, food everything. We switch paying for each date. My bf always makes a huge deal of how its my turn to pay. I dont mind paying its just obnoxious. Now hes started having me pay for his gas. Im not his piggy bank. He always says hes gonna pay be back and never does. Idk if its forgetful or sleazy. His family has money, he pays for nothing. I just dont get what his mindset is. I dont want to call him out to make it sound lIke im begging him to pay for his gas ect but i would never ever ask him to do that for me and if i did i would pay back immediately. He graduates in two years and i still have 3 after that(grad school). I wont him the money to fork over for him especially when he an actual job. This continues to be a problem to me and he doesnt see it at all. I just feel like im being used because i have more money in savings accounts(mainly for college expenses) and he thinks he can take advantage of this. We have been dating 3 years.