Is it possible to rekindle feelings that fade with the past month of a 6 year relationship?

I have been in a relationship for 6 years and my gf has been acting rather weird lately, thus i asked her am I getting boring after that she replied that she felt the feelings have fade lately, but she agreed to let me try a second chance of rekindling the feelings. She said she started feeling this way during the past month or 2. I asked her why and she said it was her changing not me. Is it still possible to win her back?and whats the best way?