Tony would never let Furio stay alive (and perhaps Carmella either) should they have an affair. Both Tony and Carmella have "issues", and yet I do think they both love each other. I want to say no, Carm and Furio won't end up getting together, but especially after last's nights episode, I say anything is possible. What you expect won't happen, probably will. That's what makes this show so good.
TIS
"Mankind must put an end to war before war puts an end to mankind. War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today." JFK
That's what makes this show so good. 
