What would be a reason you'd go ahead and start to date her?
Most Helpful Guy
First of all depends on how close the friend is. If it's just a person I know and he knows me true a friend then I would date. If the friend is a real friend I would no doubt ask the permission from my friend if its o.k that I date his ex. And I'd need to be 110% insured that it won't strike back.
Though there is always this little tricky thing that if I already have strong feelings to the girl I might even go for it without asking permission but would tell of course about it.
In other words. You did not give enough info.