My (26m) girlfriend (22f) doesn’t offer to split or even say thank you when I pay

I have been dating this girl for the past 3 months, went on more than 15 dates and she only offered to split the bill once on our first date.

While I am fine with paying for the dates as I work full time and she’s still a student, but I can’t help but feel like not appreciated enough since I haven’t even received a simple thank you, do I point this out to her?