We should learn to choose our words carefully, as we can hurt and mislead others.
Words.. can't be taken back, once you give them away. Harsh words are like bullets, no matter what they can still leave a painful injury.
And sometimes, a SORRY is not enough to heal the wounds you leave.

Stop trying to change yourself for a relationship that's not meant to be, if you're not accepted for who you are, then that person is not worth having in your life.