How Do I Tell my friend I DO NOT Want to stake him

[surfinillini]

can anyone give me any advice regarding how to tell a friend who's asked to be staked that I don't want to but in kind terms...

basically my friend had a bankroll and went on a really bad downswing and lost it all. I witnessed some of these sick beats and while he didn't play bad, he didn't react to well afterwards and seems to have lost his grinder ethic recently (probably as a result of wanting to constantly get this $$ back)...

he feels he is the best player and can play better than anyone so he plays every hand very aggressively.

so basically I do not want to stake him as I do not agree with his playing style and feel my money will goto waste...

any suggestions/thoughts ???

(as far as limits go, this would either be for $500NL or 15/30 full ring...not 1/2NL or baby limits so we're talking about a decent chunk of coin, maybe ~5K or more)

I've also transferred him a small amount on pokerstars ($500) which he quickly lost playing 1/2 limit and small buy in MTT's, I watched some of his play and I was not very happy with it.