>>24
Well done!

It may seem a bit... rude, but trust me, it's for the best. Also you learnt an interesting thing: her boyfriend isn't willing to pay to spend some good time with his girlfriend in an amusement park? Oh well. Chances are they won't stay together long if he keeps acting like that, and you "raise the level".

Keep it that way: be detached, don't be a puppy dog, but when you actually do things with her make it grandiose. She must understand that being with you is fun but not granted.

Wait for the next weekend, maybe even the one after, and then tell her that you're free on that day, and if she still wants to [something that she will want to do because you will describe it as really fun, so she will have the whole 'fun' thing activating before she actually does it]. Actually the best thing would probably to ask her like in the end of next week, but not for this weekend but the next. "I'm not free this weekend, but I have nothing planned yet (note the emphasis) for the next, so blablabla". Make sure you make the whole thing sound fun before it even has begun. That way, she'll probably be impatient to go the next week.

Of course this is all theory, there is no 100% formula, but if it works you will surely mark some points here.