I stayed friends with some guys but had to make it clear that I did not feel about them in a romantic way & it never would be. That may be the case in your situation too. It's hard to say if they haven't made that clear.

My rule of thumb was that the break-up wouldnt have happened if the relationship didn't have problems....just being friends doesn't fix those problems & just because you have common interests doesn't mean compatibility in a dating relationship.