Hooking up with a friend?

The fact that jack said its a matter of whats right tells me that he is being considerate of dave. I dont think its wrong of either of you to be involved but i completely understand jack acting how he is. To be honest even if it didnt bother him i would feel terrible about hooking up with a girl that i knew one of my friends liked...and its just not a fact of dave being pissed like it seriously makes you feel like crap which im sure you understand. If you guys really like each other theres no reason not to go for it, just be considerate when around 'dave'. But if its just a thing (fooling around) and its not really worth it all...i just wouldnt because you could mess up some good friendships for nothing more than messing around with somebody. Good luck and hope this helps