Here is my dilema. I am having some difficulties trying to bend strings. My instructor has been helping me but I am looking for some additional tips. I am learning blues guitar and have moved into the introduction into bending notes. I am using two fingers (middle and ring) to bend upwards but they catch the string above it and I have to mute that string with my index finger. Sometimes even that doesn't work and I end up sounding the string above when coming back down. Does anyone have any tips to maybe get past this or is it normal to sound the string above a little when doing this. I just want a clean sound.

Thanks in advance