If I arrived after and they had managed to get a table and a coffee, I would say, ‘oh hi! Thanks for getting the table, just going to get a drink, can I get you anything’. If they offered to buy one for me, I’d say, ‘no it’s fine, you have one already, I’ll be back in a sec’.
But, when I met my now husband I didn’t even think about taking in turns to buy rounds - we just did, in fact I would probably get more as I knew I earned more than him at the time (we worked together, sadly earn a bit less than him now!!).
I’ve never wanted that kind of relationship where people have to conform to the gender stereotypes of ‘men being gentlemanly’. We have an equal partnership where we both take equal responsibility for mental load, housework, financial stuff, and childcare. I wouldn’t have it any other way and we are so happy.
If that’s not you bag, then it’s good to iron out these issues early on - at least both of you haven’t lost out on anything (especially as you both bought and drank your own coffees!).