Hey, I got this problem. I met a girl at a swimming pool, all things were great, she likes me i like her. But it turn out she lived a bit far away, I told her that wasn't an issue to me. She agreed. So we set up a date for the next week, during that week we texted and chatted a lot, thing seemed to go very well. But the next week date wasn't exactly that awesome. She said she was tired so she wasn't that enthusiastic. During that week of chatting she asked if I would come to her brothers birthday. I said I coudn't because I had already something else planned. Turned out that it would end early, so I had the time to go to that birthday. So I texted her saying that I was able to go. She said: ''I don't care, if you want to come, come.'' That doesn't really sound like an invitation to me.
So my question is, should I still go to that birthday? And are there ways to improve my game at conversations? I'm a newbie so...

P.S. English is not my first language so it might be not good, sorry for that.

Sounds like trouble and a lot of work to me, basically what im reading is "we went on a date and she said we she was tired, even though we've planned this for a week" then "wanna come to my brothers birthday?" and after you say no once "never mind i dont wanna see you". Looks like she's half interested in you but only if you'll be her puppet

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To game at your best you have to be willing to do your worst.

Don't fall for events like the girls's brothers birthday, since you won't know anyone there and thus kinda dependent on her. Of course, if you have a good game, you can go around there, befriend the people and have a good time while showing her you are worth it. But I prefer to offer her to join "my"event instead. An event where MY social circle is present, where I am truly relaxed and open to any crazy thing that comes across my mind. I don't have to work my way up + she is dependent on me because she knows no one. It's easier.

You said you won't come and then you came, no matter what the reason was. If a girl would do this to me, I would see it as needy and a I would probably think that you cancelled that event of yours in order to come. I wouldn't really feel like I have to do any of the chasing....

That's not an invitation, really. I would simply ignore the text and the party, even if you'd go home and scratch your balls instead. it might at least give her the impression that you're busy somewhere else with other people. I would wait for her to re-initiate the contact between you since the message shows lack of respect from her side = she's got the upper hand here.