&lt;apols for the long one&gt;

My best friend and I hang out almost every day after work and over the weekend. Usually going to the cinema or at each other's place and we usually get dinner too. Either eating out, ordering in, or cooking for one another.

We usually take turns to pay and it switches back and forth generally regardless of the value of the previous dinner, unless she or I paid for something bigger say that included a bunch of drinks, then the other will pay twice in a row. Pretty casual agreement, sometimes you win, sometimes you lose.

Recently she announced she wanted to start saving to buy property, and she would eat out less etc. That's fine, though I didn't really believe her, she says this often. But she has terrible impulse control when it comes to trying to save. 

So to be sure I'm not hogging her money, I suggested we use an app to keep track or who buys dinner and who owes who what. (Not sure if this is relevant but I make 4 or 5 times more than her). She agreed and we kicked it off and I kept reminding her to log what she spends, but she was flippant and dismissive, saying it didn't matter, while I logged all the meals I paid for. (I mean meals, not soda or candy we might grab and share at the cinema or at home)

Now that we've been at it for a while, she is in debt by about 70 quid. Because she isn't logging but also the meals I happened to buy we're more expensive.

Now I feel a bit shit, coz my main intention was to be sure I didn't make her overspend, and to help her budget a little. But I also can't help but be a little miffed that I feel like I'm paying more. On the other hand I don't care, I have more disposable cash, and it could just be the luck of the draw for this period of payment.

It feels a little like Pandora's box now, and I wish I didn't start the tracking, but here we are. 

Tldr am I the asshole for tracking spending between my and my friend? Would I be the asshole to keep doing it?