Quote from Bankai231;56730:
Well if we do go out. First thing im doing is making her promise that not matter what happens with us we wont EVER spread apart.
Such promises usually bust when the two of you end up going to different colleges.
It tends to only work out in mangas. Besides, every divorced couple start off assuming they'll be bound together, and see our divorce rates are at 50%. Everyone always thinks their relationship will last, but its more of a flip of the coin. Try your best, stay optimistic, but don't be blind by your positivity to the point where you start digging your own holes. Overconfidence can sometimes prevent you from resolving an issue that you could've seen coming weeks or even months away in a relationship.
Anyways, I'd take it slow imo, even if they are no longer going out. Of course, since she is available, you want to let her know that you are interested in her, but try not to go out until this friend of yours cools down a little from this break up.
He wasn't going out with her because he didn't like her, and since he just got dumped, you going out with her would be incredibly insensitive. If the girl's accusations of him being a cheater is not true, then this guy is probably taking a lot of stress and heat right now.