Stop spending money on your girlfriend and you will surely save a good amount of money for future, I hope you got my point, stop spending on useless things, and girlfriend is one of them.
yeah I think it's also the biggest problems for teens who have a girlfriend. let alone the needs and wishes of the woman there are a lot of things? I'm sure she'll cry for ask you for to buy something for her? it happened to me? how I handle this. I would not be disconnected because I love her ?
If your girl friends are very demanding and always want is material things i think you should leave her, you can not save money in your future if you will stay with her. Saving money is always your net income less expenses equals savings thats is mandatory.