depends how long the friendship lasted.. when i write someone off, i write them off.... however, i'll let something slide once, twice, maybe three times... but when youre out... YOURE OUT!!!
Exactly, if you feel he screwed you ditch him, ignore him dont talk to him again but let him know how you feel. If you later decide to be friends down the road it can be taken 2 ways a) it was a misunderstanding, your cool be friends again b) it was easy, your a push over and hes gonna do it again. This has happened to me in the recent past, not over $ over a girl (at least that was his motivation) trash talking and bashing ensued (on his side) I played cool, stayed silent and no longer associate myself (where friends for ~8 years) IMO it was a great decision, he sometimes tries to chat, but small talk is as far as it goes now. Always try to be a bigger man, its not as easy sometimes but in the end feels much better and makes you look much better to spectators.