Hey man, some remarks from my side...
Quote:
ME
Hey xxx, nice meeting you the other day in... What was it, DM? Anyway, I'd like to get a drink with you one of these evening if you're not completely against the idea so just lemme know your schedule and we'll try to set it up
First of all, you didn't fluff talk at all, went straight to business, without giving her a reason to want to meet with you... make a reference to some cool, crazy party you are going to, or this amazing sushi place you recently discovered, whatever you think may be interesting for her... second, you were being a bit insecure about her wanting to meet up, your frame of communication should always be that girls want to meet you... third, you were too accommodating with her schedule and all...
Quote:
HER
i told You About my boyfriend

and the next weeks im to busy anYway. Writing m Bachelor thesis .. Hope u are doing Fine
She wasn't totally against meeting you... she gave you the thesis excuse, to which you could have replied "Let me know when you have passed your exam and we'll celebrate... I know this great club, bla, bla, bla..." and kept going about a neutral topic, establishing her interest in you...
Quote:
ME
That's cool, I usually try anyway
Enjoy

You simply gave up... next time ignore the excuse, don't discuss the boyfriend (there's a small chance he's not even real) and plow ahead with the convo... keep it interesting and flirty...
Good luck!