tell him polightly that you need the money now as things have gone tits up at youre end, be polight but firm, tell how you gave him a chance when his chips were down, now you need the favor returning, you dont have to tell him him any details.

If he doesnt listern and starts to give the bullshite, tell him that you have all the pm's, texts and e-mails and are currently printing them all off for a solicitor to take a look at them next week (thursday for example) if he can get money to you by wednesday, you might not bother going to the solicitors.

Id try that, if that dont work then go to small claims with all the texs,pm's and emails.

steve.