when i do something i think is best i always hurt someone

when i think that something is right to do i always end up hurting someone like i just broke up him because i liked him more as a friend now and i feel like a horrible person now because idk.....but i had to do what was right......or at least thats what i thought...........................idk i mean i didnt mean to hurt them i hope that they know that i mean idk what to say...... any advice out there???