Why would you do something that calculatedly callous? The karma in the whole mess, would be that once you got him, the same thing would happen to you. Side note** a man cannot be taken, he goes willingly into the night..
Strengthen your relationship as friends and be understanding to his problems. Point out the negative things his girlfriend does, but do it in a positive way. Lead him to resources that list good reasons to end a relationship. Always tell the truth. Make yourself available to talk anytime the guy wants. Read more from http://www.ehow.com/how_2265765_get-guy-break-up-his.html#ixzz1viyhyCiZ.