What does it mean when they say they have commitment issues?
It usually means that the fictional parents who gave birth to the character annoy him or her terribly, and that the character will punish these two people by being rude and irresponsible with everyone else s/he meets. Said character may have been fed, clothed, sheltered and protected by these two people for the first eighteen to twenty years of his or her life, but these acts mean nothing in comparison to the immense aggravation the two of them cause him or her.
