Getting back

So my first girlfriend and I broke up after 6 months because it was a bad time for us. We were both busy and trying to learn about ourselves and the relationship was tough on us as individuals. When we broke up, she told me that we shouldn’t be friends because it would make things hard. So, it’s been 6 weeks since we broke up and 4 weeks since we last talked. We see eAchother around but only say hi and keep going. I want to start getting back into her life, but am not sure what move to make because actually losing her as a friend would be the worst.