Pain in back on knees after stretching

I'm an amateur dancer and have been stretching to be able to do splits. I stretch for 15 min 2 to 3 times a day. Generally, the stretching feels really good except that in the band that is on the inner left side of my right knee. That muscle (or whatever it is) usually hurts after when I try to straighten or bend my right knee. Messaging it after helps a bit but its still sore. Also, this muscle seems to be less flexible then the rest of my knee - in that I know that I can stretch much further but it causes that muscle to produce sharp pain so I have to limit my stretching on the right leg.

Does anybody have any advice on what this is and what could be causing it? This happened before a couple of months so I took a break and the pain went away but as soon as I start again it comes back.. so resting doesn't really work unless I stop stretching my right leg for the rest of my life.. meaning no splits ever.. not something I'm willing to accept yet.

Any help please???
 
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