girlfriend vs. better-half

i never like being called girlfriend.. and never want to be a girlfriend of somebody's..
one can have multiple girlfriends (or boyfriends) at the same time, and it's just a term to distinguish on a relationship scale higher than friend and lower than mistress / wife... the term doesn't even imply the commitment it used to associate.. it could be a role just physically more intimate than a 'friend', or a role as close as a wife without legal implication, and without exclusivity...

i like the term better-half/worse-half.. half & half equals to a whole.. if u r half and s/he is half, you two become complete.. it doesn't matter whether the two are legal bound or not, 'coz better half is beyond this boundary, it's even out of a relationship scale because you two are a complete one, instead of two people having a relationship..