What Should Do For The Bum Cheek Pain While Stretching?

I think i have injured a muscle in my bum cheek whilst doing the splits. It hurts at the top of my right leg directly under my bum cheek and it only hurts when i try to do the splits or stretch that area. I ve rested it for almost 2 months now and i tried my splits again but it still hurts and i am unable to do them because of the pain. I m worried i ll lose my splits, what is it?