Parents have authority/control over their children. People don't have that type of relationship with their s/o.Just because u choose not to do the right thing doesn't mean u don't love them
That's like saying a teenager doesn't love their parents cuz they make bad decisions
Not having sex with another person is not the only factor involved in loving someone
Parent/children/family love is not the same type of love that couples have. Your family will always be your family, it is possible for your partner not to be your partner anymore.