[KiraIMustBeInvisible]

So I have a friend who was with a boy for nearly two years before they broke up this past September.
The boy she was with and I had been really good friends before they started dating, and then we drifted apart when they got together. When they broke up he and I started talking again, and he started to like me and I started to like him back.
But I know that my friend who was with him before still likes him, and I know she'd be really upset if I were to date him. And I think he knows that too, which is why he hasn't asked me out.
Anyways, my question is this; Would it be okay to ever date him?