go rob a bank or something
then buy super super comfy clothes ASAP or buy some sweet shit really quickly, drop all that shit in a storage facility. go to jail. get out of jail after X amount of time, claim all the shit you bought, and enjoy.
although it's not as simple as that, i feel like it can be done. as long as you pay in cash. the purchases aren't traceable and as long as you don't buy like a yacht, you won't be suspicious. also, if the police question where the money went, you can just tell them a lot of it fell out while you drove/ran away.
also, this girl is awesome. i think just having her around and being somewhat interested her is completely making me get over my ex. never been in this situation before though... i don't want to mess it up.