Originally Posted by Gary Stevenson
back when we were on speaking terms he never indicated to me that he was in money troubles or would have difficulty paying me back and he's been playing poker for a living since he graduated college
Sounds like you have taken the wrong approach here tbh. It is unlikely someone who is your friend hangs out with you for a long time for the sole purpose of stealing $13k. It sounds like he's busto from what you describe.
If he is a sick gambler you might be out of luck, but maybe an offer to get him away from such gambling might be +EV.
$13k is a lot, but not end of world. Suggest you write off this as a bad debt and continue on with life...lots of people in same situation for much more these days.
I suggest you read the Justin Smith threads on NWP to see how a thread like this turns out. It will make you laugh at least.