my ex girlfriend birthday will be in this weekend, what should I do

Short story: My ex-girlfriend left me 1 and half month ago, since that time we didn't communicate each other. I didn't wrote to her, she did not wrote to me, even she didn't wrote to me on my birthday day which was one month ago. Any way I am still love in her and I am thinking about her every day, there wasn't day when I did not think about her, but I am trying to forget her, but at same time I really with to take her back. Also we have a lot of common friends, so this summer probably we will meet each other, because I still have a lot of hope that we will be together one day.

So now I need advice should I send to her some flowers or anything this weekend? Or maybe I have to call her? Or it might be better not to do anything?

Thank you for advices.