hapans:

The removal of Kylo Ren’s mask in different scenes of The Force Awakens lets the audience see the conflict he feels before he murders his own father, Han Solo—a conflict we did not get a hint of in his first scene where he kills Lor San Tekka. Earlier, an unmasked Kylo Ren allows Rey to look into his eyes, and then see his fears when he is attempting to pry information from her mind. Kylo Ren shows a sign of wanting to be seen as a man and not a monster when he rips off his mask after Rey calls him a “creature in a mask” in this same scene. – StarWars.com