Do you thinking ending the relationship won't hurt her? And is it your life or your mother's? Is it you or your mom knows what you want or are you an amateur or teenager?
Listen i will just advice you smoothly that follow your heart but take your brains with you, how? I will answer that also , it is you that knows whats best for you since your a grown up,to avoid misunderstanding and conflicts ask your mom to give you justifiable reasons to why she does not support that relationship and as a real man then look for a way to talk to your mother and make her understand that all is required of her is her support nothing else , unless you never loved the lady or you were just testing yourself to her