I told him that a good friend will be there when the boyfriend fails.
I've known your type before... you love to "hang out" with the nice guys while you date and fuck the bad boys. When the bad boys break your heart you use your nice guy friend to cry on his shoulder and then you go find another bad boy to fuck and get your heart broken again.... and they cycle continues.
Sorry, but I don't play that game.
If a woman views me like a "brother" I stop and ask myself: "Will she be willing to fuck her brother?". The answer is always "No", so I don't waste my time with her.
If you think that is shallow and mean, then stop and think for a minute... is it not also using someone if you only use them for emotional support and then toss them to the side when it suits you?