Actually I think no. I dont see anything wrong with a girl paying for a own stuff when shopping with bf. Almost all girls want a bf with financially stable and fufill whatever requirments. Same like guys wanted a gf who got the face, body, understanding, blablabla.

'do girls reach a level of true maturity where she sees having a boyfriend is that must be financially stable whereby he can be her future husband.'
I think the 'must' word is being childish. Not mature. You cant count on someone 'surely' able to mantain his/hers current situation. People do have up's and down's. Even if she does meet someone who 'surely' have this requierment thing and assume that he can 100% mantain it. Does she love him? If she dont, she marry him cause of 'he's a good bargain?'.

Of course, able to find the ideal partner is the best. But most people out there just fell for someone unexpected.

same